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Posted: 2/14/2022 1:53:18 PM EDT
[#1]
Quote HistoryOriginally Posted By lilMAC25: Suddenly my subsonic 300 BLK cast loads don’t want to run consistently in my SBR ARs (12.5” and 9”). Not sure if it’s poor bullet casts, poor powder coating, inconsistent or suboptimal loads of powder. Ive also shortened the OAL from 2.255 down to around 2.240-2.245 It appears to be a short stroke issue, so I think increasing powder load will fix that. Therefore yesterday, I set up ladders of 247 gr cast and AA1680 to help me figure out the issue. My current load is 10.7 gr of AA1680 Under 247 gr NOE projectiles. I’ve increased that in .2 gr increments all the way out to 12.2 gr. I’ve got 10 round groups of each, but considering that I’ll be testing on 2 different firearms, I think I’ll increase that to 20/ea today. Side note, WEG’s post reminds me, I need to order QuickLoad. Surprised you're having issues with 1680. 1680 is arguably the most gassy, loudest powder for 300 BLK. Not so great for ultimate hush factor, but absolutely great for reliability. |
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Posted: 2/14/2022 7:02:02 PM EDT
[Last Edit: lilMAC25]
[#2]
Quote HistoryOriginally Posted By -Obsessed-: Surprised you're having issues with 1680. 1680 is arguably the most gassy, loudest powder for 300 BLK. Not so great for ultimate hush factor, but absolutely great for reliability. Quote HistoryOriginally Posted By -Obsessed-: Originally Posted By lilMAC25: Suddenly my subsonic 300 BLK cast loads don’t want to run consistently in my SBR ARs (12.5” and 9”). Not sure if it’s poor bullet casts, poor powder coating, inconsistent or suboptimal loads of powder. Ive also shortened the OAL from 2.255 down to around 2.240-2.245 It appears to be a short stroke issue, so I think increasing powder load will fix that. Therefore yesterday, I set up ladders of 247 gr cast and AA1680 to help me figure out the issue. My current load is 10.7 gr of AA1680 Under 247 gr NOE projectiles. I’ve increased that in .2 gr increments all the way out to 12.2 gr. I’ve got 10 round groups of each, but considering that I’ll be testing on 2 different firearms, I think I’ll increase that to 20/ea today. Side note, WEG’s post reminds me, I need to order QuickLoad. Surprised you're having issues with 1680. 1680 is arguably the most gassy, loudest powder for 300 BLK. Not so great for ultimate hush factor, but absolutely great for reliability. Multiple of the recorded speeds were in the 800 fps range, so it maybe that I don’t have a hot enough load (I’d like them around 1000-1050 fps). |
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Posted: 2/14/2022 8:29:51 PM EDT
[#3]
That 247 slug with 10.7 grains 1680 has a lot of air space.
Lots of air space contributes to inconsistent velocity. That load is running about 36% air. CFE-BLK will improve that air-ratio for your subs. |
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Posted: 2/14/2022 8:31:00 PM EDT
[#4]
Quote HistoryOriginally Posted By W_E_G: That 247 slug with 10.7 grains 1680 has a lot of air space. Lots of air space contributes to inconsistent velocity. That load is running about 36% air. CFE-BLK will improve that air-ratio for your subs. And sadly, will be basically just as loud. 
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Posted: 2/17/2022 1:10:02 AM EDT
[#5]
Quote HistoryOriginally Posted By W_E_G: That 247 slug with 10.7 grains 1680 has a lot of air space. Lots of air space contributes to inconsistent velocity. That load is running about 36% air. CFE-BLK will improve that air-ratio for your subs. Thanks. That makes a lot of sense. Well, I’ll try these ladders (I didn’t get a chance to finish them out this weekend as I’d hoped) and go shoot them to see if any stay subsonic. I’m not changing powder anytime soon. I’ve got an 8 lb can (probably around 6 lb left) to shoot up. |
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Posted: 2/17/2022 9:25:08 AM EDT
[#6]
At least the 1680 can be used in other caliber rifle loads.
Not ideal for 223, but definitely will work. |
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Posted: 2/17/2022 11:03:33 AM EDT
[#7]
The airspace issue can be mitigated - a little anyway - with some of the tricks used with pistol cartridges that were originally designed in black powder days. Like .45 Colt with fast-ish powders, if you “shake” the cartridge, or tilt the gun muzzle-up just before firing, you can reduce the variation in ignition and thus variation in velocity.
I agree that 1680 isn’t ideal for subs. It works great in 7.62x39 in full power loads, but it seems to like the case to be kinda full for best ignition. It’s not as touchy as H110, but then not many powders are.  CFE-BLK, on the other hand is much more flexible, and apparently isn’t as prone to ignition issues with lower powder volumes as a lot of other powders. I haven’t done any experimentation with subs and Lil’ Gun, but it’s a powder that seems to have been developed specifically to address how finicky H110 is, and may also be flexible in subs… |
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Posted: 2/17/2022 11:16:12 AM EDT
[Last Edit: -Obsessed-]
[#8]
Quote HistoryOriginally Posted By GHPorter: The airspace issue can be mitigated - a little anyway - with some of the tricks used with pistol cartridges that were originally designed in black powder days. Like .45 Colt with fast-ish powders, if you “shake” the cartridge, or tilt the gun muzzle-up just before firing, you can reduce the variation in ignition and thus variation in velocity. I agree that 1680 isn’t ideal for subs. It works great in 7.62x39 in full power loads, but it seems to like the case to be kinda full for best ignition. It’s not as touchy as H110, but then not many powders are. CFE-BLK, on the other hand is much more flexible, and apparently isn’t as prone to ignition issues with lower powder volumes as a lot of other powders. I haven’t done any experimentation with subs and Lil’ Gun, but it’s a powder that seems to have been developed specifically to address how finicky H110 is, and may also be flexible in subs… An issue with LilGun in 300BLK is it burns extremely hot. With the lower velocity and increased time the base is subjected to this temp, it has a tendency to melt the base of projectiles. I've melted lead, poly coated lead, and even copper projectiles. It vaporizes and gets stuck in the tube, on the carrier, and in particular on the boat tail. It gets deposited on the gas ring edges and causes jams. Quickly. And it's a royal PITA to clean.  Attached File Attached File60x magnification by the gas rings. These deposits cause friction in the carrier leading to reliability issues.  Attached File |
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Posted: 2/17/2022 11:25:29 AM EDT
[#9]
And THAT my friends is why I don’t mess with non-copper-jacketed bullets in direct-impingement guns.
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Posted: 2/17/2022 11:28:57 AM EDT
[Last Edit: -Obsessed-]
[#10]
Quote HistoryOriginally Posted By W_E_G: And THAT my friends is why I don’t mess with non-copper-jacketed bullets in direct-impingement guns. Admittedly, I don't shoot copper jacketed bullets but rather copper plated, so I cannot say whether or not the same would happen with a jacket vs thin plating. Is what I can say is I tried Berry's and Everglades copper plated projectiles and they both had the exact same behavior. The phenomenon was universal with every projectile combination with Lil'Gun I used, and disappeared immediately upon switching to a different powder. None of the other powders I have tried (CFE BLK, 1680, H110, N110, N120, SBR, and likely others I've dabbled with) have not shown this behavior. It would make sense though that a jacket would be fine as the thicker copper would be able to dissipate the heat better vs absorbing it and phase changing. But I have no real world proof of that. |
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AL, USA
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Posted: 2/17/2022 11:43:15 AM EDT
[Last Edit: savage243]
[#11]
Save the lilgun for supersonic 110 barnes and if you want to have fun get you a side charging upper with any length barrel you like and shoot 160gr cast with 3.5 gr of promo or reddot.very quiet
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Posted: 2/18/2022 8:29:26 AM EDT
[#12]
I placed an order with Larry for a Lee 230gr bullet mold and have 8lbs of N110. Bullets will be powder coated and shot from an 8.5” AR pistol. Any tips for starting loads? I want to stay subsonic.
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Posted: 2/18/2022 8:48:45 AM EDT
[#13]
Quote HistoryOriginally Posted By Bashby: I placed an order with Larry for a Lee 230gr bullet mold and have 8lbs of N110. Bullets will be powder coated and shot from an 8.5” AR pistol. Any tips for starting loads? I want to stay subsonic. My opinion is you're not going to get N110 to cycle subs. I wasn't able to get it even close to cycling, let alone cycle reliably. I had to get them up to close to 1300 FPS before 220s would even cycle. I doubt 230s would get you there, but maybe I'm wrong. I've found that you can get copper coated/jacketed bullets to cycle more reliably with lower gas powders because the swaging action of copper creates more friction than lead/poly coated lead, so it generally requires a ~tad~ more powder to get the same speed, which means more gas. I'd have gone N120. |
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NH, USA
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Posted: 2/18/2022 11:23:13 AM EDT
[#14]
The best powder I found to cycle subs is CFE black. I could get the lowest fps with it with Berrrys 220 pills. I think it was 620 or 660 fps. I read that its made to be gassy to cycle better. People say its loud but thats not my experience. I use adjustable gas blocks on my guns though.
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Posted: 2/18/2022 11:31:03 AM EDT
[#15]
Quote HistoryOriginally Posted By chucku: The best powder I found to cycle subs is CFE black. I could get the lowest fps with it with Berrrys 220 pills. I think it was 620 or 660 fps. I read that its made to be gassy to cycle better. People say its loud but thats not my experience. I use adjustable gas blocks on my guns though. If you don't think it is loud it's because you've never heard a truly quiet 300BLK setup. AGB or not. 
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Posted: 2/18/2022 11:58:00 AM EDT
[#16]
The closer you get to super-quiet, the closer you get to erratic velocity, crap accuracy
AND baffle strikes |
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Posted: 2/18/2022 12:07:21 PM EDT
[#17]
CFE-BLK is your best friend for subs in 300BLK
The manufacturer put their best effort and experience toward developing a powder for this exact application. I think some folks are going too far on projectile-weight. 200 to 220 is the velocity/accuracy sweet spot for 300BLK subs. Try the LAPUA 200. Fifty cents per. Again, a product designed SPECIFICALLY for this exact application. |
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Posted: 2/18/2022 12:35:04 PM EDT
[#18]
4227 and berrys 220's work great for me.
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NH, USA
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Posted: 2/18/2022 2:55:03 PM EDT
[#19]
Quote HistoryOriginally Posted By -Obsessed-: If you don't think it is loud it's because you've never heard a truly quiet 300BLK setup. AGB or not. I have a handi rifle and a trash panda. I guarantee you its quiet. |
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Posted: 2/18/2022 3:23:39 PM EDT
[#20]
Quote HistoryOriginally Posted By chucku: I have a handi rifle and a trash panda. I guarantee you its quiet. Locked-breech rifles are the answer if you want maximum sound reduction. |
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PA, USA
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Posted: 2/22/2022 10:23:17 AM EDT
[#21]
Go easy on me......300 Black out is a whole new animal to me. I will be using a Noveske 10.5" barrel 1:7 twist. My plan is to use this as a dedicated suppressed gun. I have a fair amount of cfe blk for loading and purchased hornady 208 eldm to start test loads. Am I on the right path for the subs I want to load. Any other bullet/powder combination I should try? Any other bullet weights I should give a try? Trying to avoid key holeing. Is there any other questions I should have asked? Anything else I should consider? Thanks in advance!
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Posted: 2/22/2022 10:28:52 AM EDT
[#22]
How fast do you want to run that 208 bullet?
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Posted: 2/22/2022 10:30:55 AM EDT
[#23]
Quote HistoryOriginally Posted By suprmatch: Go easy on me......300 Black out is a whole new animal to me. I will be using a Noveske 10.5" barrel 1:7 twist. My plan is to use this as a dedicated suppressed gun. I have a fair amount of cfe blk for loading and purchased hornady 208 eldm to start test loads. Am I on the right path for the subs I want to load. Any other bullet/powder combination I should try? Any other bullet weights I should give a try? Trying to avoid key holeing. Is there any other questions I should have asked? Anything else I should consider? Thanks in advance! My opinion is if you are primarily shooting subs suppressed is to go shorter. They make an 8.3" if I remember right. Go with that one. You don't need the length and even an 8" barrel with a can will be pushing 16" with more weight out front. The 8" balances so much better. I had a 10.3" on my DD and went down to 8.3" and am much happier. CFE BLK is a great powder to get started with. It is easy to get good consistent results with. Just know that there are quieter powders out there so do not get discouraged if the rifle is a little louder than you were hoping for. That's the biggest complaint I hear about it and I have plenty of first hand experience with it. I've loaded and shot over 15k rounds of 300 BLK so I have a bit of experience with it. The 208s will be fine but youay consider cheaper blasting ammo. Berry's and Everglades both make 220s that will be easier to make more reliable with less gaseous powders, and will be cheaper to boot. Other than that I would just encourage you to play around with it. It's a VERY versatile round and there are so many different paths and combos to try. Do you have a chronograph? |
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NH, USA
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Posted: 2/22/2022 11:10:30 AM EDT
[#24]
What would you consider a quiet powder? Trail boss?
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Posted: 2/22/2022 11:24:33 AM EDT
[#25]
Quote HistoryOriginally Posted By chucku: What would you consider a quiet powder? Trail boss? Sure, in a bolt action. TB has no use in Semi autos. I'm personally most interested in semi auto, and considering we are on an AR-15 themed site I'd say most others are too. That said, Lil'Gun, N110, and N120 are going to be your quietest powders. I used to have a video of me alternating rounds in the same mag between CFE BLK and LilGun. The difference was quite significant. I wouldn't want to shoot 100 rounds of CFE BLK out of an AR without earpro. With LilGun I could shoot all day and not have any discomfort at all. N120 can be very quiet simply due to the fact it is SO gassy that you can download a BUNCH and still reliably cycle. It is still really quiet even at 1050 FPS but I could get it to reliably cycle down to 730 FPS with Berry's 220s. That was really, really quiet, perhaps even as quiet as Lil'Gun, which is incredibly quiet but rather finicky in nature. |
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PA, USA
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Posted: 2/22/2022 12:03:35 PM EDT
[Last Edit: suprmatch]
[#26]
How fast do you want to run that 208 bullet? My opinion is if you are primarily shooting subs suppressed is to go shorter. They make an 8.3" if I remember right. Go with that one. You don't need the length and even an 8" barrel with a can will be pushing 16" with more weight out front. The 8" balances so much better. I had a 10.3" on my DD and went down to 8.3" and am much happier. CFE BLK is a great powder to get started with. It is easy to get good consistent results with. Just know that there are quieter powders out there so do not get discouraged if the rifle is a little louder than you were hoping for. That's the biggest complaint I hear about it and I have plenty of first hand experience with it. I've loaded and shot over 15k rounds of 300 BLK so I have a bit of experience with it. The 208s will be fine but you may consider cheaper blasting ammo. Berry's and Everglades both make 220s that will be easier to make more reliable with less gaseous powders, and will be cheaper to boot. Other than that I would just encourage you to play around with it. It's a VERY versatile round and there are so many different paths and combos to try. Do you have a chronograph? |
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Posted: 2/22/2022 12:12:11 PM EDT
[#27]
The lower the loading density, the less-consistent the velocity.
The slower the bullet, the greater risk of baffle strike. |
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PA, USA
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Posted: 2/22/2022 4:05:17 PM EDT
[#28]
Quote HistoryOriginally Posted By W_E_G: The lower the loading density, the less-consistent the velocity. The slower the bullet, the greater risk of baffle strike. what speed do you suggest to try and obtain? |
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NH, USA
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Posted: 2/22/2022 5:18:50 PM EDT
[#29]
Around 1000 fps. 1120 is speed of sound at sea level I think? I like them slower, as they are even more quiet. The problem is functionality. I can make all kinds of loads cycle using an adjustable gas block.
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Posted: 2/22/2022 5:34:40 PM EDT
[Last Edit: -Obsessed-]
[#30]
Quote HistoryOriginally Posted By suprmatch: what speed do you suggest to try and obtain? Depends on powder, but I generally shoot for 1050. I'd say 950-1050 range is probably what 95% of shooters aim for. Somewhere in there. If it is super gassy I might drop to 950 or even lower if aim comfortable with stability...a 7 twist will stabilize a 220 down to below 700 FPS. If it is not very gassy I may move up to 1075. Much higher than that and you may have variation that might go super on you. 
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Posted: 2/22/2022 7:12:33 PM EDT
[Last Edit: W_E_G]
[#31]
Some shooters think 1000 fps is "too noisy."
OK, run it slower and take your chances with baffle strikes. But hey, the bullets stabilize "most of the time." Your chances of stabilizing a subsonic bullet increase when you shoot bullets SPECIFICALLY DESIGNED for subsonic use. People using these super-streamlined heavy bullets - which were designed for magnum pressures - in subsonic loads really makes me cringe. I recommend the Lapua 200 - desigmed for subsonic. https://www.lapua.com/product/30-cal-fmjbt-subsonic-bullet-b416-130-g-200-gr/ Look at all that bearing surface.  Attached File |
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NH, USA
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Posted: 2/22/2022 8:24:11 PM EDT
[#32]
Fast twist rates helps stabilize heavy bullets. My Honey Badger has a 1:5. Always check for key holing before attaching a suppressor.
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TX, USA
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Posted: 2/26/2022 7:37:13 PM EDT
[#33]
Alright guys, need to tap into the minds of all the 300 blackout masters.
 6.5" V seven barrel. I shit canned my subsonic project exactly a year ago, but I'm back at it. This time using 190 gr Sub Xs. Using H4198 and everything is working fine. I have gone down the rabbit hole a little bit researching about minimizing port pop, utilizing faster powders, and adjustable gas blocks/carriers all in the hopes to make this little bastard as quiet as possible. I do realize that an AR reciprocating system is loud enough on it's own, but I think there is an opportunity to reduce the sound a little bit lower. 1. The gas block and tube are proprietary to V seven, if I'm going to mess with the gas, I would want to try a titanium adjustable carrier. As a side note, all reloads down to 900 fps held the bolt open on the last round without the suppressor. 2. I have read that fast powders such as Accurate #9, N105/110 would yield more quiet results. What are your thoughts? https://photos.app.goo.gl/ZevFDNPQd9XV6hJ99 Video reference for current subsonic reloads noise (still fine tuning). |
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Posted: 2/26/2022 7:43:03 PM EDT
[#34]
I think you can specialize a weapon to a particular load so that you get closer exactly the result you seek for a specific application.
That weapon may not run so well with other loads. Perfect example is 1911 pistol with loads for bullseye competition. Anything other than the "tuned" load, and its malfunction city. |
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TX, USA
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Posted: 2/26/2022 9:40:01 PM EDT
[#35]
Quote HistoryOriginally Posted By W_E_G: I think you can specialize a weapon to a particular load so that you get closer exactly the result you seek for a specific application. That weapon may not run so well with other loads. Perfect example is 1911 pistol with loads for bullseye competition. Anything other than the "tuned" load, and its malfunction city. |
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Posted: 2/26/2022 10:05:23 PM EDT
[#36]
Its OK to experiment if it entertains you or serves some unique purpose for you.
300BLK will never be my GO-TO-HELL rifle. I like it as sort of a puzzle and amusement. Its lethal too. Just not the answer to any particular application for me currently. |
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Posted: 2/27/2022 7:29:55 PM EDT
[#37]
Looking to get a decent starting point with a powder measurement with what I currently have on hand.
Looking to stay subsonic out of a 10" barrel Berrys 220gr IMR 4198 Any idea a good charge for this combo? Everything I have found is a different barrel length. Thank you! |
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NH, USA
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Posted: 2/27/2022 8:13:35 PM EDT
[Last Edit: chucku]
[#38]
13.0 grn. Work down from there.
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Posted: 3/5/2022 12:27:28 PM EDT
[Last Edit: rabidus]
[#39]
Just got a Ruger mini 14 in 300BO.
Bought some 125tnt’s. And cast Lee 155gr, powdercoated and gas checked. Powders: 8lbs of lil gun (would like to use this up as i have so much) 1lb H110 .75lb 1680 Will make supersonic load only. No can in Cali so I’m stuck with supersonic. Plus, the gun is designed to cycle supersonic or suppressed subsonic only. I do want to make a heavy cast load that will just cycle the gun as I run ‘n gun on private land and shoot steel and I don’t want to chew it up. The TNT’s will be primarily be self defense loads and occasional milk jug slayer. I loaded a string of 125gr TNT’s at 2.075” COL. I also remember Dryflash’s post that the mag intentions should have an ogive of .250” for proper feeding. They would put my COL to 2.030” Anybody run their 125gr TNT’s at 2.075” COL or similar without feeding issues. I have a mini 14 so accuracy is not it’s best feature. Just trying to get something 100% functional first, then adjust for accuracy. |
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NH, USA
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Posted: 3/5/2022 4:47:12 PM EDT
[#40]
Quote HistoryOriginally Posted By rabidus: Just got a Ruger mini 14 in 300BO. Bought some 125tnt’s. And cast Lee 155gr, powdercoated and gas checked. Powders: 8lbs of lil gun (would like to use this up as i have so much) 1lb H110 .75lb 1680 Will make supersonic load only. No can in Cali so I’m stuck with supersonic. Plus, the gun is designed to cycle supersonic or suppressed subsonic only. I do want to make a heavy cast load that will just cycle the gun as I run ‘n gun on private land and shoot steel and I don’t want to chew it up. The TNT’s will be primarily be self defense loads and occasional milk jug slayer. I loaded a string of 125gr TNT’s at 2.075” COL. I also remember Dryflash’s post that the mag intentions should have an ogive of .250” for proper feeding. They would put my COL to 2.030” Anybody run their 125gr TNT’s at 2.075” COL or similar without feeding issues. I have a mini 14 so accuracy is not it’s best feature. Just trying to get something 100% functional first, then adjust for accuracy. That method works for heavy bullets. Its usually not needed for lighter ones like you have. I bought the Magpull .300 blk specific mags and I have never had a problem with feeding, with any bullets, no matter what the weight or COAL. Only way to know if they'll work is to make a dummy round and plunk test it in your chamber. Or load one up and try it. If I get one that wont seat I shoot it in my Handi rifle. It shoots anything! |
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UT, USA
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Posted: 3/18/2022 7:14:05 PM EDT
[Last Edit: Utahshooting]
[#41]
Quote HistoryOriginally Posted By Bashby: I placed an order with Larry for a Lee 230gr bullet mold and have 8lbs of N110. Bullets will be powder coated and shot from an 8.5” AR pistol. Any tips for starting loads? I want to stay subsonic. Finishing up a .300 build with 8" barrel. Intend on shooting suppressed subs exclusively. Got Berry's 200 and 220 gr and Missouri Bullet company 245 gr RNFP coated projectiles. 245 is heavy, but I got 750 of them on sale. For powder I have 1680, IMR 4198. Win 296, and H335 to choose from. Lyman 50th shows good data for 1680 and 4198. Suppressor will be either Nomad or Resonator K. I'll be working up some chrono'd loads and checking for key holing before loading a batch. Two questions: 1. Any good experiences with these powders and heavy coated projectiles? 2. You mention a side charger above. I have a dual side charging upper but wasn't going to use it as son and I are both Lefty's. Was concerned over gas. Is this not an issue? |
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Posted: 3/21/2022 3:52:45 PM EDT
[#42]
For guys casting their own, Lee has a version of the 312-160 2R in their closeouts/overrun section listed as a 310-158 2R. May be of use for those powder coating and sizing to start a couple thousandths smaller. The listing says it will come stamped as a 312-160 still, and also the current description says at the bottom it is a dual cavity, but the main listing (and price, $64) show it to be a 6 cavity mold (less handles).
They must have had a batch get machined undersize. Link: |
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AL, USA
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Posted: 3/27/2022 8:20:16 PM EDT
[Last Edit: savage243]
[#43]
Berry's 220 plated 9.0. Alliant 2400 work great for me . I have a 16 inch barrel
With a pistol length. |
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OH, USA
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Posted: 3/28/2022 8:08:08 AM EDT
[Last Edit: m411b30]
[#44]
Anyone tried Vihtavuori 3N38 for subs?
According to Quickload, 7.3 grains will achieve 1094fps out of a 10.5" barrel using the Hornady 190g SubX. at 22,359PSI.. 100% burn. Can anyone confirm? ETA: I also thought about trying Unique for the same bullet? 5.8g for 1081fps. and 29,102PSI.. Also 100% burn. |
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TN, USA
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Posted: 5/19/2022 12:01:03 PM EDT
[#45]
Sharing this here for those using Sig MCX barrels with the fast 1:5" twist.
---- The Berry's 220 gr states a max 1:7" twist and 1300 FPS maximum. You can then convert this to RPM. MV X 720/Twist Rate = RPM Thus a 1:7" twist at 1300 FPS is 133,714 RPM Now let's take 133,714 as a maximum RPM for the 220 gr Berry's, and solve for the maximum velocity allowed in a 1:5" twist. We find that the max velocity for a 220 gr Berry's plated bullet in a 1:5" twist Sig barrel is approximately 928 FPS. All you must do as a reloader is use a good chronograph (one that is not -+ a significant FPS from true), and keep your load well under 928 FPS. I run my 220 Berry's at right at 900 FPS using CFE BLK. No crimp, and be sure to bell or aggressively chamfer the case mouth when seating. The plating on these is not thick, so you must be cautious. |
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Posted: 6/30/2022 12:41:29 PM EDT
[#46]
Quote HistoryOriginally Posted By -Obsessed-: That said, Lil'Gun, N110, and N120 are going to be your quietest powders. .... N120 can be very quiet simply due to the fact it is SO gassy that you can download a BUNCH and still reliably cycle. It is still really quiet even at 1050 FPS but I could get it to reliably cycle down to 730 FPS with Berry's 220s. That was really, really quiet, perhaps even as quiet as Lil'Gun, which is incredibly quiet but rather finicky in nature. Quote HistoryOriginally Posted By -Obsessed-: That said, Lil'Gun, N110, and N120 are going to be your quietest powders. .... N120 can be very quiet simply due to the fact it is SO gassy that you can download a BUNCH and still reliably cycle. It is still really quiet even at 1050 FPS but I could get it to reliably cycle down to 730 FPS with Berry's 220s. That was really, really quiet, perhaps even as quiet as Lil'Gun, which is incredibly quiet but rather finicky in nature. Seems like the options for a good 300 sub powder are limited with no perfect or ideal choice? CFE BLK is commonly recommended (and easiest for me to find) but apparently not a quiet as other options. Lil-gun can apparently be really quiet but after reading about the issues that Obsessed detailed above, I have no interest in dealing with that no matter how quiet it is. N110 probably won't cycle (but I have read some state it will cycle in a short barrel/pistol gas barrel?). I've read a lot of good things about N120 but Vihtavuori powders are hard to find locally and I'm not crazy about the price or it being really gassy. Originally Posted By -Obsessed-: I used to have a video of me alternating rounds in the same mag between CFE BLK and LilGun. The difference was quite significant. I wouldn't want to shoot 100 rounds of CFE BLK out of an AR without earpro. With LilGun I could shoot all day and not have any discomfort at all. Originally Posted By ALASKANFIRE: I always thought the Remington 220 flat base would be good to load but they never sold them as components. Some type of 200+gr projectile seems like the natural choice but I think it was W_E_G who mentioned earlier in the thread making his sub loads with 150gr M80 projectiles which would be nice. Hard to know where to start with this? Well I guess not too hard as I already have some CFE-BLK so I guess I'm starting there like it or not but now I'm thinking I may not be happy with the results? One last comment - these long threads are really hard to follow and learn from especially for a round like the BLK that can be loaded either as a super or subsonic round and everybody seems to want something different. If it was at least broken down into 1 thread for Supers and one for Subs, it would be a lot easier to cull the information people are seeking from them. |
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Posted: 6/30/2022 2:31:19 PM EDT
[#47]
Quote HistoryOne last comment - these long threads are really hard to follow and learn from especially for a round like the BLK that can be loaded either as a super or subsonic round and everybody seems to want something different. If it was at least broken down into 1 thread for Supers and one for Subs, it would be a lot easier to cull the information people are seeking from them. Some history, when 300 blk came out this forum was flooded with 300 blk threads. So we directed all 300 blk posts/thread into this thread, so as the whole forum would not be taken over. Same way we do with "where can I find, primers, powder, ect". We have a tacked thread at the top of the page for that. Something you have to understand is anyone who is an Arfcom member can post in these threads. So a certain amount of discretion needs to be applied as to the validity of the posts. Hard to do when you are learning and don't know the posters. This is where you do some research by reading and learning the quality posters on this forum. If something is dangerous I will remove it, but poor advice, poor practices, or doing it the hard way is not against the Conduct Code. What I would suggest is start your own thread with a descriptive title, copy paste from your post above and ask your questions. Format your post like this one, double spacing between complete questions and number questions. Easier to read/ quote gets more responses. That way when you get an answer, your post can be quoted easily with the answer in a different color font. Normally blue. I have been in the 300 blk game from the beginning, hope you saw my post one page 1 of this thread. Good luck |
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Posted: 7/1/2022 2:48:10 PM EDT
[#48]
Quote HistoryOriginally Posted By dryflash3: What I would suggest is start your own thread with a descriptive title, copy paste from your post above and ask your questions. Good luck Appreciate the reply/advice. I still trying to learn as much as I can on my own but I will post new thread when I have more specific questions.  |
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Posted: 7/1/2022 2:53:52 PM EDT
[#49]
Quote HistoryOriginally Posted By cheekibreeki: Sharing this here for those using Sig MCX barrels with the fast 1:5" twist. ---- The Berry's 220 gr states a max 1:7" twist and 1300 FPS maximum. You can then convert this to RPM. MV X 720/Twist Rate = RPM Thus a 1:7" twist at 1300 FPS is 133,714 RPM Now let's take 133,714 as a maximum RPM for the 220 gr Berry's, and solve for the maximum velocity allowed in a 1:5" twist. We find that the max velocity for a 220 gr Berry's plated bullet in a 1:5" twist Sig barrel is approximately 928 FPS. All you must do as a reloader is use a good chronograph (one that is not -+ a significant FPS from true), and keep your load well under 928 FPS. I run my 220 Berry's at right at 900 FPS using CFE BLK. No crimp, and be sure to bell or aggressively chamfer the case mouth when seating. The plating on these is not thick, so you must be cautious. Thank you for this |
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Posted: 7/1/2022 4:01:40 PM EDT
[#50]
Quote HistoryOriginally Posted By airgunner: Appreciate the reply/advice. I still trying to learn as much as I can on my own but I will post new thread when I have more specific questions. Before the reloading data starts, is the "How to reload" section. Top of the page in this forum are a lot of resources, click around, so much good info up there. |
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