User Panel
User Panel
User Panel
|
Posted: 6/28/2017 10:43:32 PM EDT
[#1]
Quote HistoryOriginally Posted By GHPorter:
That's very interesting, as one of the publicly released goals of the A1 was to be very close ballistically to the M855. However, given the same bullet weight and the increased MV, I was wondering how that was going to work... |
|
|
|
|
Posted: 6/28/2017 10:43:39 PM EDT
[#2]
So, I got 30 cases of 1X LC primed and ready, went to validate my load idea's and only found 2 sources.
One is for 63gr Sierra SMP's with a suggested start of 23.7gr H335, and Lyman 50th with 22.5gr of H335 with the SS109 62gr bullet. So, I guess start at 22.5, and go from there. I found that I have 200 of them, not 100, so that helps, I guess. 
I guess it is worth 9 bucks to be on the safe side. 
|
|
|
|
|
Posted: 6/29/2017 8:01:42 AM EDT
[#3]
|
|
|
|
|
Posted: 6/29/2017 10:14:25 AM EDT
[#4]
Quote HistoryOriginally Posted By Stump70:
Tried 24 grains of 8208. Low 2800fps. Group size over 2 inches. It is a compressed load. I don't think XBR is the powder for this bullet. ETA: Forgot to mention there were ejector swipes, but no flattened primers. |
|
|
|
|
Posted: 6/29/2017 10:20:22 AM EDT
[#5]
@RCC1 What is your OAL for your loads? Any pressure signs?
|
|
|
|
|
Posted: 6/29/2017 10:38:46 AM EDT
[#6]
Quote HistoryOriginally Posted By jaqufrost:
@RCC1 What is your OAL for your loads? Any pressure signs? |
|
|
|
|
Posted: 6/29/2017 10:47:32 AM EDT
[#7]
Quote HistoryOriginally Posted By RCC1:
2.26, no crimp, some primer flattening but nothing serious to be worried about. |
|
|
|
|
Posted: 6/29/2017 1:42:08 PM EDT
[#8]
I thought the M855A1 had a very special powder?
Replicating the velocity with commercial powder may not be feasible. |
|
|
|
|
Posted: 6/29/2017 4:40:09 PM EDT
[#9]
Quote HistoryOriginally Posted By 10mm_:
I thought the M855A1 had a very special powder? Replicating the velocity with commercial powder may not be feasible. I got the velocity right using CFE223, but the accuracy wasn't there IMHO, from looking at the pictures of my targets it was about 2 MOA which is in spec. I prefer better accuracy than that which I achieved with XBR 8208 but gave up around 100 FPS. When my powder shows up I will do a ladder test with H335 and try a hotter load with XBR 8208. |
|
|
|
|
Posted: 6/29/2017 5:33:09 PM EDT
[#10]
Quote HistoryOriginally Posted By RCC1:
My understanding is that factory loaded M855A1 uses SMP-842 powder, the closest thing readily available to my knowledge is H335. I got the velocity right using CFE223, but the accuracy wasn't there IMHO, from looking at the pictures of my targets it was about 2 MOA which is in spec. I prefer better accuracy than that which I achieved with XBR 8208 but gave up around 100 FPS. When my powder shows up I will do a ladder test with H335 and try a hotter load with XBR 8208. That seems like QUITE A BIT of pow..... 
|
|
|
|
|
Posted: 6/29/2017 8:08:41 PM EDT
[#11]
I got a ladder built from 22.5gr to 27.0gr of H335, 3 of each.
I'll be watching very closely as I work up. I was really amazed as I started seating the bullets, these things are really long. I pulled out a 77gr SMK, and they are almost the same length. I ended up at 2.255" OAL. |
|
|
|
USA
|
Posted: 6/29/2017 8:34:19 PM EDT
[#12]
How consistent are these projectiles in their length, measured base to tip?
|
|
|
|
Posted: 6/29/2017 8:44:35 PM EDT
[#13]
I'll measure some up later tonite, but with the titanium tip, I was noticing that the OAL was very consistent.
|
|
|
|
|
Posted: 6/29/2017 8:52:12 PM EDT
[#14]
Quote HistoryOriginally Posted By ChevelleDave:
I got a ladder built from 22.5gr to 27.0gr of H335, 3 of each. I'll be watching very closely as I work up. I was really amazed as I started seating the bullets, these things are really long. I pulled out a 77gr SMK, and they are almost the same length. I ended up at 2.255" OAL. Interested in the results. |
|
|
|
|
Posted: 6/29/2017 9:40:07 PM EDT
[#15]
Everything is ready for tomorrow.
|
|
|
|
NC, USA
|
Posted: 6/29/2017 11:15:03 PM EDT
[#16]
Quote HistoryOriginally Posted By RCC1:
I should have some H335 in a few days. Hoping to solve the FPS puzzle soon. I also plan to push XBR 8208 some more to see if I maintain velocity and keep accuracy. Stump70 said on page 2 that 24gr of XBR was compressed. Did you experience the same with 24gr? What about 25gr? I've had several opportunities lately to get some XBR, and now I may have a reason to get some...heard a lot of good things about it as well. |
|
|
NC, USA
|
Posted: 6/29/2017 11:21:09 PM EDT
[Last Edit: deezbill]
[#17]
Quote HistoryOriginally Posted By ChevelleDave:
I got a ladder built from 22.5gr to 27.0gr of H335, 3 of each. I'll be watching very closely as I work up. I was really amazed as I started seating the bullets, these things are really long. I pulled out a 77gr SMK, and they are almost the same length. I ended up at 2.255" OAL. Take a look at my pic on the last page with measurements - they are almost exactly the same length as 77 SMK. I just measured a few and they were all really close together. |
|
|
|
Posted: 6/30/2017 1:54:30 AM EDT
[#18]
Quote HistoryOriginally Posted By jaqufrost:
Barrel length? Primer? OAL? |
|
|
|
|
Posted: 6/30/2017 2:04:12 AM EDT
[Last Edit: ChevelleDave]
[#19]
Ready to go.
I think it is just getting to be compressed at 26.5 and 27.0gr. I couldn't hear anything or feel anything, but it looked like it was close to it. I'll be watching closely. Here is the OAL of 10 bullets. 
|
|
|
|
|
Posted: 6/30/2017 7:28:09 PM EDT
[#20]
I just got home from the range.
I think that H335 is working pretty well. I need to take a break, then I will take pics of the targets and cases and download the chrono. Got to 3000 fps and 1-1.5 or so MOA with virtually no pressure signs. |
|
|
|
|
Posted: 6/30/2017 8:45:24 PM EDT
[#21]
Quote HistoryOriginally Posted By ChevelleDave:
I just got home from the range. I think that H335 is working pretty well. I need to take a break, then I will take pics of the targets and cases and download the chrono. Got to 3000 fps and 1-1.5 or so MOA with virtually no pressure signs. |
|
|
|
|
Posted: 7/1/2017 1:09:55 AM EDT
[Last Edit: ChevelleDave]
[#22]
So, I got to the range set up at 50 yards and re-zero'd the scopes on my AR-15 and 300 BO. I just moved them around cause I got a deal on the Primary Arms 300 BO ACSS Reticle. Very nice scope.
By the time I was done, I just shot the test from 50 yards, too lazy to move to 100. I need to look into a sandbag for the front rest, and I need to get out and get some more trigger time. I also guarantee Someone else can tighten these groups up, I'm somewhat limited in the trigger finger dept.
Target #1 
Target #2 
I'm also losing that warm fuzzy feeling about the MagnetoSpeed Chronograph. I got the height below bore set perfectly, and have tried different sensitivities. I think I will call them Wednesday and see what they say, it misses a lot of shots. IMHO 
And the brass, I think it looks good. 
So, 2983 fps at 26.5gr H335, with about 1-1.5 MOA. I think it can be tightened up as well. Edit my edit on the yardage. 
|
|
|
|
NC, USA
|
Posted: 7/1/2017 6:57:46 AM EDT
[#23]
Nice work!
|
|
|
|
Posted: 7/1/2017 10:13:12 AM EDT
[#24]
@ChevelleDave what length barrel?
|
|
|
|
|
Posted: 7/1/2017 11:35:22 AM EDT
[#25]
16", carbine length gas system.
|
|
|
|
|
Posted: 7/1/2017 7:43:04 PM EDT
[#26]
Quote HistoryOriginally Posted By ChevelleDave:
So, I got to the range set up at 50 yards and re-zero'd the scopes on my AR-15 and 300 BO. I just moved them around cause I got a deal on the Primary Arms 300 BO ACSS Reticle. Very nice scope. By the time I was done, I just shot the test from 50 yards, too lazy to move to 100. I need to look into a sandbag for the front rest, and I need to get out and get some more trigger time. I also guarantee Someone else can tighten these groups up, I'm somewhat limited in the trigger finger dept.
Target #1 http://www.ar15.com/media/mediaFiles/327759/M855-Target-1-242868.jpg Target #2 http://www.ar15.com/media/mediaFiles/327759/M855A1-Target-2-242870.jpg I'm also losing that warm fuzzy feeling about the MagnetoSpeed Chronograph. I got the height below bore set perfectly, and have tried different sensitivities. I think I will call them Wednesday and see what they say, it misses a lot of shots. IMHO http://www.ar15.com/media/mediaFiles/327759/M855A1-Chrono-242871.jpg And the brass, I think it looks good. http://www.ar15.com/media/mediaFiles/327759/M855A1-Brass-242869.jpg So, 2983 fps at 26.5gr H335, with about 1-1.5 MOA. I think it can be tightened up as well. Edit my edit on the yardage. Also I have a magnetospeed also, I have never had one issue with until I tried the M855A1 projectiles. It got very finicky with them. I have one of these now that I will be testing with next weekend. 
|
|
|
|
|
Posted: 7/1/2017 11:32:54 PM EDT
[Last Edit: ChevelleDave]
[#27]
Yes, that is true. 2-3 MOA But, as I say, someone else will probably get better grouping then me, with this platform. If I switched over to the other rifle, with the better trigger, I could tighten it up. But, I think that this is more of a "combat" load isn't it?
I'm going to try to load up a few more and try next time at 100 yards. I think around 26.0gr is worth a little more of a look. I was wondering if the problem with the MagnetoSpeed wasn't related to the projectile, maybe it is. I've looked into the LabRadar, pretty cool, but I don't think I need to go that far down the rabbit hole. It will be interesting to see how it does with the M855A1 projectiles.
|
|
|
|
|
Posted: 7/1/2017 11:49:10 PM EDT
[#28]
Quote HistoryOriginally Posted By RCC1:
Good work. If the groups were shot at 50 yards wouldn't the MOA be 2-3? Also I have a magnetospeed also, I have never had one issue with until I tried the M855A1 projectiles. It got very finicky with them. I have one of these now that I will be testing with next weekend. http://i300.photobucket.com/albums/nn38/rccox/Guns/78897983-EE50-47A0-AA4A-5412081CF670.jpg
|
|
|
|
|
Posted: 7/5/2017 5:20:33 PM EDT
[Last Edit: RCC1]
[#29]
I spent some time today and loaded some M855A1 rounds with H335.
Going off of Chevelledaves info I'm going to try the following. 26 grains 26.5 grains 27 grains 27.5 grains Looking to go see what they do Saturday morning. Here's some pictures because I was bored. Redding small body sizer 
Lee neck tensioner 
Powder time 
2.26 COL 
Ready to go 
|
|
|
|
NC, USA
|
Posted: 7/5/2017 5:40:24 PM EDT
[#30]
Looking forward to it
|
|
|
NC, USA
|
Posted: 7/5/2017 7:47:20 PM EDT
[Last Edit: deezbill]
[#31]
Quote HistoryOriginally Posted By RCC1:
I'm going to try some more XBR 8208 loads and plan to order some H335 this week. As good as CFE is with my heavier loads I don't think it's the right powder for M855A1 projectiles. I'm interested in how the results line up with the 25.7gr of SMP-842 from that video jwg22 had which showed a dissection of a factory cartridge. Those charges you reported had good velocities (and good accuracy I might add) considering they're around 25gr. |
|
|
|
Posted: 7/5/2017 7:55:42 PM EDT
[#32]
Quote HistoryOriginally Posted By deezbill:
Are you going to do this as you work your H335 loads? I'm interested in how the results line up with the 25.7gr of SMP-842 from that video jwg22 had which showed a dissection of a factory cartridge. Quote HistoryOriginally Posted By deezbill:
Originally Posted By RCC1:
I'm going to try some more XBR 8208 loads and plan to order some H335 this week. As good as CFE is with my heavier loads I don't think it's the right powder for M855A1 projectiles. I'm interested in how the results line up with the 25.7gr of SMP-842 from that video jwg22 had which showed a dissection of a factory cartridge. |
|
|
|
|
Posted: 7/5/2017 9:34:32 PM EDT
[#33]
Kool, I'll be interested to see what you get for results.
I'll wait till I make up another batch. |
|
|
|
|
Posted: 7/6/2017 6:48:32 PM EDT
[#34]
I got some more XBR 8208 test loads done today.
I had really good accuracy with 25 grains of XBR at 2850 FPS. I am going to retest the 25 grain load along with a 25.5 grain load. FYI- I did feel the very slightest bit of compression with the 25.5 grain load. 
Pictures of case fill. 25 grain- 
25.5 grain- 
|
|
|
|
|
Posted: 7/8/2017 11:13:36 AM EDT
[#35]
Here's my Saturday update.
Per my earlier post I tested the following M855A1 loads. H335 26gr 26.5gr 27gr 27.5gr(actually didn't test as I got pressure signs at 27gr) XBR 8208 25gr 25.5gr It was fairly windy this morning so the groups aren't perfect. All shots were done at 100 yards and IMHO all are MOA or less. All loads are in LC cases, CCI 400 primers, and no crimp. First up is the H335 tests- 26 grains 
26.5 grains 
27 grains (this is probably too hot, primers flattened and ejector swipes) 
Didn't shoot the 27.5 grain rounds. XBR 8208 tests- 25 grains(same as tested last week) 
25.5 grains(slightly compressed load) 
I would also like to add that I used a MagnetoSpeed last week and a LabRadar this week. I would think the LabRadar would be more accurate. In my opinion H335 in 26 or 26.5 grains is the closest you can get to factory loaded M855A1. 
|
|
|
|
|
Posted: 7/8/2017 11:35:51 AM EDT
[#36]
Looks like I'll be trying 26.5 of H335 sometime. Thanks RCC1!
|
|
|
|
|
Posted: 7/8/2017 11:42:15 AM EDT
[#37]
Quote HistoryOriginally Posted By jaqufrost:
Looks like I'll be trying 26.5 of H335 sometime. Thanks RCC1! |
|
|
|
NC, USA
|
Posted: 7/8/2017 12:04:42 PM EDT
[#38]
Very nice work! ...nice toys, too
|
|
|
|
Posted: 7/8/2017 12:50:36 PM EDT
[#39]
Looking back at My info, I was thinking about 26.0gr as well. Nice work.
|
|
|
|
|
Posted: 7/18/2017 9:39:24 PM EDT
[Last Edit: jhud]
[#40]
23gr IMR 8208 Xbr oal 2.255 taper crimped.
Loaded in factory primed lake city new brass. 7 yards from muzzle. 20 inch barrel m16a3 2950 fps average plus or minus 11fps This was 10 rounds. |
|
|
|
|
Posted: 7/18/2017 9:47:07 PM EDT
[#41]
Quote HistoryOriginally Posted By jhud:
23gr IMR 8208 Xbr oal 2.255 taper crimped. Loaded in factory primed lake city new brass. 7 yards from muzzle. 20 inch barrel |
|
|
|
|
Posted: 7/21/2017 5:14:09 PM EDT
[Last Edit: jhud]
[#42]
My scale is correct. I verified after reading your results.
How is my velocity so much higher with 23gr IMR8208XBR I'm using an alpha chrony. Its never led me to think it is off. weather effect it but not the day I was at range. Primers were semi flat but not flowing. No crater. |
|
|
|
|
Posted: 7/23/2017 6:48:31 PM EDT
[#43]
I've started the bulk reloading process. Got the first 200 done, got another 800 to do to get my first case finished.
|
|
|
|
|
Posted: 7/23/2017 9:17:31 PM EDT
[Last Edit: RustyKnifeUSMC]
[#44]
Quote HistoryOriginally Posted By RCC1:
I've started the bulk reloading process. Got the first 200 done, got another 800 to do to get my first case finished. http://i300.photobucket.com/albums/nn38/rccox/Guns/A3A89DC1-22EF-4B17-B021-D5AF5BEE7564.jpg http://i300.photobucket.com/albums/nn38/rccox/Guns/DE582236-05E1-49C1-9DC7-16C20B905BCF.jpg http://i300.photobucket.com/albums/nn38/rccox/Guns/03A3A315-3320-48FD-B9D9-3001872FEBFC.jpg Did you end up deciding on the 25.0 gr of IMR 8208 XBR or 26.0 of H335? |
|
|
|
|
Posted: 7/23/2017 10:13:33 PM EDT
[#45]
Quote HistoryOriginally Posted By rocco1695:
RCC1, Did you end up deciding on the 25.0 gr of IMR 8208 XBR or 26.0 of H335? Quote HistoryOriginally Posted By rocco1695:
Originally Posted By RCC1:
I've started the bulk reloading process. Got the first 200 done, got another 800 to do to get my first case finished. http://i300.photobucket.com/albums/nn38/rccox/Guns/A3A89DC1-22EF-4B17-B021-D5AF5BEE7564.jpg http://i300.photobucket.com/albums/nn38/rccox/Guns/DE582236-05E1-49C1-9DC7-16C20B905BCF.jpg http://i300.photobucket.com/albums/nn38/rccox/Guns/03A3A315-3320-48FD-B9D9-3001872FEBFC.jpg Did you end up deciding on the 25.0 gr of IMR 8208 XBR or 26.0 of H335? |
|
|
|
NC, USA
|
Posted: 7/23/2017 10:41:47 PM EDT
[#46]
Quote HistoryOriginally Posted By RCC1:
I've started the bulk reloading process. Got the first 200 done, got another 800 to do to get my first case finished. http://i300.photobucket.com/albums/nn38/rccox/Guns/A3A89DC1-22EF-4B17-B021-D5AF5BEE7564.jpg http://i300.photobucket.com/albums/nn38/rccox/Guns/DE582236-05E1-49C1-9DC7-16C20B905BCF.jpg http://i300.photobucket.com/albums/nn38/rccox/Guns/03A3A315-3320-48FD-B9D9-3001872FEBFC.jpg I love the stripper clips, too! |
|
|
|
Posted: 7/24/2017 12:34:33 AM EDT
[#47]
Quote HistoryOriginally Posted By RCC1:
My final load is 26.3 grains of H335. |
|
|
|
|
Posted: 7/24/2017 6:03:50 AM EDT
[#48]
Quote HistoryOriginally Posted By ChevelleDave:
Did you do more testing at 26.gr of H335? Curious as to the results. Quote HistoryOriginally Posted By ChevelleDave:
Originally Posted By RCC1:
My final load is 26.3 grains of H335. I settled at 26.3 as I got very similar velocity as 26.5 but none of the occasional minor pressure signs. |
|
|
|
|
Posted: 8/9/2017 6:33:49 PM EDT
[#49]
Quote HistoryOriginally Posted By RCC1:
I did some more testing at 26, 26.3, and 26.5. I settled at 26.3 as I got very similar velocity as 26.5 but none of the occasional minor pressure signs. |
|
|
|
|
Posted: 8/9/2017 8:46:42 PM EDT
[#50]
Quote HistoryOriginally Posted By jhud:
What cases are you using ?? Quote HistoryOriginally Posted By jhud:
Originally Posted By RCC1:
I did some more testing at 26, 26.3, and 26.5. I settled at 26.3 as I got very similar velocity as 26.5 but none of the occasional minor pressure signs. |
|
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
