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Posted: 1/12/2022 10:37:58 PM EDT
[#1]
I’ve been loading 220 and 110’s, but never anything in the 125 and up range.
What have you all found this range good for? All purpose loadings or something specific? |
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NH, USA
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Posted: 1/12/2022 10:53:12 PM EDT
[#2]
Quote HistoryOriginally Posted By nmxdavenn: I’ve been loading 220 and 110’s, but never anything in the 125 and up range. What have you all found this range good for? All purpose loadings or something specific? Most bullets in this range are match bullets. Some are HP. I load them all. I only target shoot so I cant give any real word terminal ballistic info. |
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Posted: 1/12/2022 11:03:06 PM EDT
[#3]
Quote HistoryOriginally Posted By nmxdavenn: I’ve been loading 220 and 110’s, but never anything in the 125 and up range. What have you all found this range good for? All purpose loadings or something specific? Speer 125s are the cheapest bulk bullets you can load. Also most 125s with powder for velocity will still have good terminal performance. |
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Posted: 1/14/2022 12:10:44 PM EDT
[Last Edit: GHPorter]
[#4]
My 120-ish loads have been with 125 grain open-tip or polymer-tipped bullets - Hornady 30192s, and Sierra 2121s for the former, Hornady 3019s and Sierra 4625 for the latter. I don’t hunt with these, but they are extremely accurate on paper.
Above that, I’ve used bulk and “not bulk” 147-150 grain FMJs. These are clearly not hunting bullets, but they can be anywhere from “OK” to great accuracy-wise. Hornady’s 3037 150gr FMJ BT bullets are very accurate at 300 Blackout velocities (I haven’t pushed hard, but I’ve gotten around 1850-1900 fps with them). These loads are relatively inexpensive and are great for general purpose practice. And they’re fun to shoot.  Edited for formatting. |
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IN, USA
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Posted: 1/14/2022 2:54:33 PM EDT
[#5]
For all of you guys who reload subs, what is the shortest length you find acceptable to use?
I ask because I am currently processing a bunch of brass and I am finding a lot of them shorter than the minimum recommended length of 1.357" before sizing. Some are as short as 1.346" with the majority of them being between 1.350"-1.355" long. Should I be scrapping anything less than 1.357"? |
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Posted: 1/14/2022 3:32:01 PM EDT
[#6]
Quote HistoryOriginally Posted By Mav3rick: For all of you guys who reload subs, what is the shortest length you find acceptable to use? I ask because I am currently processing a bunch of brass and I am finding a lot of them shorter than the minimum recommended length of 1.357" before sizing. Some are as short as 1.346" with the majority of them being between 1.350"-1.355" long. Should I be scrapping anything less than 1.357"? Cases grow in length after sizing. |
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IN, USA
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Posted: 1/14/2022 5:50:11 PM EDT
[Last Edit: Mav3rick]
[#7]
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Posted: 1/14/2022 6:00:02 PM EDT
[#8]
Quote HistoryOriginally Posted By Mav3rick: All before sizing. Size a couple of cases, then measure them. They will be fine most likely. |
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IN, USA
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Posted: 1/14/2022 7:53:56 PM EDT
[Last Edit: Mav3rick]
[#9]
Quote HistoryOriginally Posted By dryflash3: Well there's your problem. Size a couple of cases, then measure them. They will be fine most likely. Ok. I will try that. Thank you. Some of this was purchased last year from a seller on the EE who said it was already resized. So I am guessing that the pre-sized stuff I bought that is too short is scrap? Kicking myself for not checking it at the time I bought it, but that was a while ago. |
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IN, USA
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Posted: 1/16/2022 6:00:56 PM EDT
[#10]
After running the ones that were short that weren't sized, they now measure long enough to use so thanks again.
The ones that are already sized that are less than 1.357"-so am I just sol on those? Most range between 1.350-1.355, but there were a few less than 1.350". Is it safe to load any of these or should I just scrap them? |
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Posted: 1/16/2022 6:23:17 PM EDT
[#11]
Quote HistoryOriginally Posted By Mav3rick: After running the ones that were short that weren't sized, they now measure long enough to use so thanks again. The ones that are already sized that are less than 1.357"-so am I just sol on those? Most range between 1.350-1.355, but there were a few less than 1.350". Is it safe to load any of these or should I just scrap them? 1.348 is saami minimum. I'd probably load them all and not think twice. |
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Posted: 1/16/2022 8:36:46 PM EDT
[#12]
Quote HistoryOriginally Posted By Mav3rick: After running the ones that were short that weren't sized, they now measure long enough to use so thanks again. The ones that are already sized that are less than 1.357"-so am I just sol on those? Most range between 1.350-1.355, but there were a few less than 1.350". Is it safe to load any of these or should I just scrap them? I would use those cases next time I made a batch of 9mm shotshells. |
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IN, USA
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Posted: 1/17/2022 9:21:12 AM EDT
[#13]
Thanks guys.
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Posted: 1/20/2022 3:10:42 PM EDT
[#14]
Looking for some supersonic data for 130gr Barnes TTSX and TSX (I have several hundred of each)
The TSX I know can expand at lower velocities and have more case capacity with longer OAL sans plastic tip. These will be deer rounds specifically. I have lil gun, H110 and SW Blackout. Seen some data in archives for 17.5gr H110 but wanted to see if anyone else can post their experience too. |
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Posted: 1/20/2022 5:32:27 PM EDT
[Last Edit: W_E_G]
[#15]
Velocity is going to depend on your barrel length.
Pressure is going to be affected SIGNIFICANTLY by bullet seating depth. Quickload says the 130-grain Barnes with 18.8 grains H-110 (100% loading density) seated to 2.245" makes 58,404 PSI. I used the 2.245" overall length for the Quickload calculation because that's what I found in a reference for 300BO. I would probably seat the bullet a little deeper, and use a little less powder. 1900 fps out of an eight-inch barrel. That's gonna be a HOT load. SAAMI spec for 300BO is 55,000 psi. Although, you're firing it in a gun normally used for 5.56 - which is SAAMI at 62,000 PSI. The military had a say in setting the SAAMI spec for 300BO. They settled on 55,000 psi because higher pressure made the bolt run too fast for their equipment, and manner of use. Biggest issue is gonna be the primer. Make damn sure you don't use a shitty thin primer if you are playing with a full case of H-110. You could seat the bullet a mere TENTH OF AN INCH deeper, for a 2.145" overall length, cut the powder charge to 16.9 grains, still have 100% loading density with H-110, and still make very good velocity, but 4000 psi less pressure. I like to get more case/bullet contact whenevever I can. Do take note of the significant difference in powder charge needed when the bullet seating depth is changed a mere TENTH OF AN INCH. Here is the Quickload screenshot for the former load. Apolgies for how the pressure numbers are blurred. That blurring on the pressure numbers is an unfortunate artifact of screenshots from Quickload.  Attached File |
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Posted: 1/20/2022 5:39:29 PM EDT
[#16]
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Posted: 1/20/2022 5:40:21 PM EDT
[#17]
Quote HistoryOriginally Posted By W_E_G: Velocity is going to depend on your barrel length. Pressure is going to be affected SIGNIFICANTLY by bullet seating depth. Quickload says the 130-grain Barnes with 18.8 grains H-110 (100% loading density) seated to 2.245" makes 58,404 PSI. I used the 2.245" overall length for the Quickload calculation because that's what I found in a reference for 300BO. I would probably seat the bullet a little deeper, and use a little less powder. 1900 fps out of an eight-inch barrel. That's gonna be a HOT load. SAAMI spec for 300BO is 55,000 psi. Although, you're firing it in a gun normally used for 5.56 - which is SAAMI at 62,000 PSI. The military had a say in setting the SAAMI spec for 300BO. They settled on 55,000 psi because higher pressure made the bolt run too fast for their equipment, and manner of use. Biggest issue is gonna be the primer. Make damn sure you don't use a shitty thin primer if you are playing with a full case of H-110. You could seat the bullet a mere TENTH OF AN INCH deeper, for a 2.145" overall length, cut the powder charge to 16.9 grains, still have 100% loading density with H-110, and still make about the same pressure and velocity. I like to get more case/bullet contact whenevever I can. Do take note of the significant difference in powder charge needed when the bullet seating depth is changed a mere TENTH OF AN INCH. Here is the Quickload screenshot for the former load. Apolgies for how the pressure numbers are blurred. That blurring on the pressure numbers is an unfortunate artifact of screenshots from Quickload. https://www.ar15.com/media/mediaFiles/105614/130_barnes_jpg-2247732.JPG 8.5” barrel, using CCI BR-4’s Thank you, and very informative! I agree in deeper seating depth and I think I’ll work a load around 16.5gr and see where I’m at on the chrono. |
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Posted: 1/20/2022 5:42:59 PM EDT
[#18]
Going from 8" barrel to 8.5" barrel, you'll pick up 20 fps.
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Posted: 1/23/2022 10:29:38 PM EDT
[#19]
What shellplate are ya’ll using for dillon casefeeder? I have small pistol, large pistol and small rifle
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PA, USA
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Posted: 1/23/2022 10:49:38 PM EDT
[Last Edit: Sujumanji]
[#20]
Quote HistoryOriginally Posted By HorseLady68W: What shellplate are ya’ll using for dillon casefeeder? I have small pistol, large pistol and small rifle Small Rifle works great. I haven't tried others but I figured the one for .223 should work and it does. |
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Posted: 1/24/2022 11:49:56 PM EDT
[Last Edit: dryflash3]
[#21]
@W_E_G
Primed 300 Blackout brass 34 cents per This is not the WTF thread, so please post in that thread at the top of the page. dryflash3 |
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OH, USA
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Posted: 2/5/2022 8:31:07 PM EDT
[#22]
How do I search for a particular keyword within this thread only?
Right now it seems like I have to read 73 pages in the hope of finding what I'm looking for |
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Posted: 2/5/2022 8:50:30 PM EDT
[#23]
Quote HistoryOriginally Posted By samurai84: How do I search for a particular keyword within this thread only? Right now it seems like I have to read 73 pages in the hope of finding what I'm looking for Not a way to search for key words. Google the name of the thread, ar15.com and your search helps. |
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Posted: 2/7/2022 2:49:58 AM EDT
[Last Edit: BlackTaco]
[#24]
Okay, I feel like a complete idiot.
I do not understand how to measure the .250” ogive. I purchased the Hornady kit. Can someone spell this out for me? I can’t find any videos online on how to measure this. Am I measuring just the bullet?  Attached FileOr the bullet loaded in the case?  Attached FileAnd is everyone using Pmag .300BLK specific mags? |
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Posted: 2/7/2022 9:26:53 AM EDT
[#25]
Quote HistoryOriginally Posted By BlackTaco: Okay, I feel like a complete idiot. I do not understand how to measure the .250” ogive. I purchased the Hornady kit. Can someone spell this out for me? I can’t find any videos online on how to measure this. Am I measuring just the bullet? https://www.ar15.com/media/mediaFiles/126656/1A82A50A-35DE-4FBE-99C8-32E9EBE4F5FE_jpe-2270071.JPG Or the bullet loaded in the case? https://www.ar15.com/media/mediaFiles/126656/EB41B154-5A63-45CD-8047-23DB10C5EC20_jpe-2270072.JPG And is everyone using Pmag .300BLK specific mags? For magazines, I and most of the people I shoot with use Lancers. |
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Posted: 2/7/2022 9:34:18 AM EDT
[#26]
Quote HistoryOriginally Posted By BlackTaco: Okay, I feel like a complete idiot. I do not understand how to measure the .250” ogive. I purchased the Hornady kit. Can someone spell this out for me? I can’t find any videos online on how to measure this. Am I measuring just the bullet? https://www.ar15.com/media/mediaFiles/126656/1A82A50A-35DE-4FBE-99C8-32E9EBE4F5FE_jpe-2270071.JPG Or the bullet loaded in the case? https://www.ar15.com/media/mediaFiles/126656/EB41B154-5A63-45CD-8047-23DB10C5EC20_jpe-2270072.JPG And is everyone using Pmag .300BLK specific mags? I prefer these over everything else. So far function 100%. |
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USA
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Posted: 2/7/2022 9:53:45 AM EDT
[#27]
Quote HistoryOriginally Posted By BlackTaco: Okay, I feel like a complete idiot. I do not understand how to measure the .250" ogive. I purchased the Hornady kit. Can someone spell this out for me? I can't find any videos online on how to measure this. Am I measuring just the bullet? https://www.ar15.com/media/mediaFiles/126656/1A82A50A-35DE-4FBE-99C8-32E9EBE4F5FE_jpe-2270071.JPG Or the bullet loaded in the case? https://www.ar15.com/media/mediaFiles/126656/EB41B154-5A63-45CD-8047-23DB10C5EC20_jpe-2270072.JPG And is everyone using Pmag .300BLK specific mags? |
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Posted: 2/7/2022 1:01:00 PM EDT
[#28]
Quote HistoryOriginally Posted By Sujumanji: Small Rifle works great. I haven't tried others but I figured the one for .223 should work and it does.
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Posted: 2/7/2022 1:31:51 PM EDT
[#29]
Quote HistoryOriginally Posted By wildearp: Small pistol plate, with the thick spacer washer added, works much better than the rifle plate. What is this thick spacer washer? |
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Posted: 2/7/2022 2:38:01 PM EDT
[Last Edit: dryflash3]
[#30]
Quote HistoryOriginally Posted By BlackTaco: Okay, I feel like a complete idiot. I do not understand how to measure the .250" ogive. I purchased the Hornady kit. Can someone spell this out for me? I can't find any videos online on how to measure this. Am I measuring just the bullet? https://www.ar15.com/media/mediaFiles/126656/1A82A50A-35DE-4FBE-99C8-32E9EBE4F5FE_jpe-2270071.JPG Or the bullet loaded in the case? https://www.ar15.com/media/mediaFiles/126656/EB41B154-5A63-45CD-8047-23DB10C5EC20_jpe-2270072.JPG And is everyone using Pmag .300BLK specific mags? Here is a link to my post on page 1 of this thread explaining this. The .250 ogive method is a name I gave to this procedure. I got it off the AAC website when it was up. https://www.ar15.com/forums/Armory/300-Blackout-Master-Thread/42-385765/#i3572696 edit to answer other question. You don't use a Hornady headspace gauge to measire the .250 ogive point on a billet. A caliper is used. The headspace gauge is used to measure the set back on the case after sizing. Nothing to due with a bullet. |
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Posted: 2/7/2022 2:44:59 PM EDT
[Last Edit: BlackTaco]
[#31]
Quote HistoryOriginally Posted By dryflash3: @BlackTaco Here is a link to my post on page 1 of this thread explaining this. The .250 ogive method is a name I gave to this procedure. I got it off the AAC website when it was up. https://www.ar15.com/forums/Armory/300-Blackout-Master-Thread/42-385765/#i3572696 Thanks @dryflash3, but I’ve read over that about 8 times now and still do not understand how I’m measuring anything a .250”. It’s the Hornady bullet comparator kit, to measure ogive. Is that the distance from the tip of the bullet to the ogive? It’s the diameter of a 5.56 case, but I don’t understand how I’m using this .250” number in relation to seating bullets in the case. Should we be using a number in relation to the entire case and bullet after loaded, and then measured with an ogive gauge with an over all ogive with case length of 1.60” or something like that? Lol - omg, just see you updated your post. It’s seriously as simple as using a caliper and sliding up/down the bullet until you hit .250”? Then line that up with the bump inside the mag, and that’s your depth for that specific bullet? I’ve put off loading .300 for 4 weeks waiting on this Hornady comparator kit to come in. 🤦🏻♂️ |
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Posted: 2/7/2022 2:55:29 PM EDT
[#32]
Quote HistoryOriginally Posted By BlackTaco: Thanks @dryflash3, but I've read over that about 8 times now and still do not understand how I'm measuring anything a .250". Is that the distance from the tip of the bullet to the ogive? It's the diameter of a 5.56, but I don't understand how I'm using this .250" number in relation to seating bullets in the case. Should we be using a number in relation to the entire case and bullet after loaded, and then measured with an ogive gauge with an over all ogive with case length of 1.60" or something like that? At the point it measures near zero, then it tapers (curves) up to .308 in this case. Somewhere along that curve the bullet measures .250. (same as the outside of the neck of a 223 case) In 223 the neck is even with the front mag tab. Read this until you understand it. Get a mag and and a round and look at it. With the shorter 300 blk, the neck won't reach the tab. If you want your rounds to feed something .250 must be at the front tab. We use the bullet ogive for this. So to use a 223 mag with a 300 blk round, the bullet diameter (.250 ogive) .250 Must be even with the front mag tab. Re read my post I linked all explained, and I just explained it again.. good luck. |
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Posted: 2/7/2022 2:57:31 PM EDT
[#33]
Quote HistoryOriginally Posted By dryflash3: The ogive is the curved part of the bullet. At the point it measures near zero, then it tapers (curves) up to .308 in this case. Somewhere along that curve the bullet measures .250. (same as the outside of the neck of a 223 case) In 223 the neck is even with the front mag tab. Read this until you understand it. Get a mag and and a round and look at it. With the shorter 300 blk, the neck won't reach the tab. If you want your rounds to feed something .250 must be at the front tab. We use the bullet ogive for this. So to use a 223 mag with a 300 blk round, the bullet diameter (.250 ogive) .250 Must be even with the front mag tab. Re read my post I linked all explained, and I just explained it again.. good luck. I get it now, just had no idea it would’ve been so incredibly simple. |
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Posted: 2/7/2022 2:59:59 PM EDT
[#34]
Glad I could explain it.
 No go forth and spread the .250 ogive method far and wide.
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Posted: 2/7/2022 3:12:22 PM EDT
[#35]
Quote HistoryOriginally Posted By dryflash3: Glad I could explain it. No go forth and spread the .250 ogive method far and wide. Lol!! 10-4! |
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Posted: 2/7/2022 8:51:08 PM EDT
[Last Edit: KTM300XCW]
[#36]
I am a long time re-loader but new to the 300 BLK. I am looking for some feedback/opinions on my load data/results.
My 300 BLK has an 8.5" BA Stainless 1/7" Barrel. I am using an Primary Arms 1x MicroPrism for optic. I was shooting at 50 Meters (~54 Yards). Wind was blowing hard from different directions. I almost didn't shoot for groups. I decided to start with 125GR. bullets as I'd like to use them for deer/hogs here in Central Texas. I am handloading Speer 125Gr. TNT's to an OAL of 2.060". For powder I am using H110. Primers are Wolf .223 Magnum. Cases were LC 5.56 converted once fired. I fired some Factory Remington 125Gr. Flat Base Hollow Points, which are loaded to an OAL of 1.140 and are running right at 2000 FPS. Primers looked fine. In order to match that with a 125Gr. TNT I had to load 18.6 gr. of H110. This load chrono'd at 1995 FPS. This load is more accurate than the Remington, but not as good as 18.8 Gr running at 2021 FPS. I know both the 18.6 and 18.8 are over book max and I am seeing the start of some primer cratering and light ejector swipes (see pics), but not really anything I'm not used to seeing with NATO pressure 5.56. I am hoping someone can tell me what kind of pressures I might be running and if you think I'm safe at 18.6 and/or 18.8. Or maybe I should try another powder. I hope not because I have 16 Lbs. of H110. Also, are these the types of velocities you guys are seeing with a 125Gr out of an 8.5" barrel? ETA: I ran all the way up to 19.4 Gr. and the groups did not get any better although pressure signs were more apparent. The last photo shows all of the primers 18.6 in the back up to 19.4 in the front. 18.6gr. and 18.8gr. primers  Attached FileRemington Factory 125Gr. - 10 Rounds  Attached FileSpeer 125 TNT / 18.6 Gr. H110 - 12 Rounds  Attached FileSpeer 125 TNT / 18.8 Gr. H110 - 15 Rounds  Attached FileAll Primers  Attached File |
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Posted: 2/7/2022 10:07:43 PM EDT
[#37]
If the primers aren’t leaking, you’re safe.
Your load is near SAAMI maximum for 300BLK with H-110 and 125-grain bullet. SAAMI maximum for 300BLK is 55,000 psi. Whereas SAAMI maximum for 5.56 NATO is 62,000 psi. Why the difference? Because US military told SAAMI to go with 55,000 because higher pressures made the bolt run too fast in their full-auto 300BLK guns. I think you can go 62,000 psi safely with 300BLK in a semiautomatic AR. Provided you use sturdy primers. Don’t use shitty thin small rifle primers if you run hot 300BLK. |
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Posted: 2/7/2022 10:12:34 PM EDT
[#38]
If you look closely at your brass for your hotter loads, you can see where the case head is extruding into the extractor cutout or the ejector cutout.
In my opinion, if you run brass that hard, it’s a one-and-done for that case. At minimum, those extrusion burrs are going to give you a hassle getting into the shell holder if you try to reload cases with those burrs. Primer pocket might be loose too. |
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Posted: 2/7/2022 10:37:55 PM EDT
[#39]
Quote HistoryOriginally Posted By W_E_G: If you look closely at your brass for your hotter loads, you can see where the case head is extruding into the extractor cutout or the ejector cutout. In my opinion, if you run brass that hard, it’s a one-and-done for that case. At minimum, those extrusion burrs are going to give you a hassle getting into the shell holder if you try to reload cases with those burrs. Primer pocket might be loose too. Thank You. What do you think about the brass at 18.6 and 18.8? I know it's hard to tell from a photo. I'd like to at least make what the factory Remington rounds are producing which is 2000 fps. In your opinion would I be producing enough velocity/energy for hunting with a 125gr. if I backed down to say 18.4 or even 18.2? Maybe 1900 or 1950 fps? I assume that might work out to about 100 yards on deer and hogs? 300 BLK is so foreign to me compared to the .308 and 300 Win Mag I'm used to shooting. |
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Posted: 2/7/2022 11:34:41 PM EDT
[Last Edit: W_E_G]
[#40]
I've killed deer with steel BB's from a Crosman. What are you trying to kill?
H-110 can get hateful all the sudden while you're going up the pressure. If you want wild expansion, buy bullets that expand wildly at whatever velocity you're sending them. Nothing survives being shot in the lung. Nothing. Pretty much heart and liver too. Shot placement is way more important than bullet magic. I don't like it when the case head is flowing back into the recesses of the bolt. So my advice is back it off if you start to see that. We got a female deer that keeps coming through our back yard. Obviously been shot high in the shoulder with something. Tough deer. Bad shot placement. I seen a buck that came through the yard with an arrow sticking out of practically the same spot. Chasing two does with an arrow stuck out his back. Tough deer. Another bad shot. |
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Posted: 2/8/2022 12:01:55 AM EDT
[Last Edit: BlackTaco]
[#41]
Okay, so this is what .250” should look like on a 220Gr Amax right? I scored it with the caliper, hopefully that can be seen. And it’s right at the bump. Looks like my COAL is 2.11” - that’s not too deep?
I’m starting with 10.4gr of CFEBLK for subsonic. Running CCI small rifle primers. Can I start loading now!?   Attached File |
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Posted: 2/8/2022 12:49:22 AM EDT
[#42]
Just loaded 5 at 10.4gn, and a few at 10.9gn. Both locked back the bolt on an empty mag and the 10.4 was quiet as F!!!
Going to load up a few batches with different gn and check accuracy. Stoked! |
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Posted: 2/8/2022 12:58:57 AM EDT
[#43]
Quote HistoryOriginally Posted By BlackTaco: Okay, so this is what .250" should look like on a 220Gr Amax right? I scored it with the caliper, hopefully that can be seen. And it's right at the bump. Looks like my COAL is 2.11" - that's not too deep? I'm starting with 10.4gr of CFEBLK for subsonic. Running CCI small rifle primers. Can I start loading now!? https://www.ar15.com/media/mediaFiles/126656/B1919835-54D1-4E75-945E-1277CFA627AD_jpe-2271117.JPG Heaver bullets get loaded to mag length. |
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Posted: 2/8/2022 3:45:39 AM EDT
[Last Edit: BlackTaco]
[#44]
Quote HistoryOriginally Posted By dryflash3: The .250 ogive method is for 180 gr and lighter bullets. Heaver bullets get loaded to mag length. I checked my 220gr factory Sig .300BLK subs and they were right about the same length (I think they are SMK - so no polymer tip like Hornady 208’s). I also read that CFEBLK likes to be compressed more than not. Should I not seat the 208’s so deep? I also have 800ct of 178gr Hornady .308’s - I can’t get those subsonic right? I have Lil-Gun, CFEBLK, and H110. |
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Posted: 2/8/2022 1:41:32 PM EDT
[#45]
To be perfectly honest I only shoot supers and don't load the heavies in this caliber.
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Posted: 2/8/2022 1:48:53 PM EDT
[#46]
You can seat to whatever length you like.
Load a small batch and TEST in your gun. |
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Posted: 2/8/2022 2:14:58 PM EDT
[#47]
Thanks guys! So far subs seem to be fine.
I have to load up the 110gr and 178gr and see what happens. |
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Posted: 2/13/2022 10:54:43 AM EDT
[Last Edit: lilMAC25]
[#48]
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. |
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Posted: 2/13/2022 11:06:50 AM EDT
[#49]
Any chance that those cast bullets deposited fouling in the gas port?
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Posted: 2/13/2022 6:22:48 PM EDT
[#50]
Quote HistoryOriginally Posted By W_E_G: Any chance that those cast bullets deposited fouling in the gas port? They’re powder coated and my supersonic loads run fine, so I’d guess no. |
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