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Suppressed 5.56 SBR Velocity Tests--41 Factory Loads from 10.5", 11.5", 12.5" & 14.5" ALL DONE! (Page 5 of 6)
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Love this thread and it should be a sticky.
I get pretty much the same results across the board as these when I chrono, except for the 64G Gold Dots for some reason. Don't know if I just have a hotter lot than Eagle or what, but I get ~150fps more out of the 64g GDs than he does with both my 14.5" and 11.5" rifles using the same suppressor as Eagle. I even tried it with 2 different Chronographs. |
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Originally Posted By swampvol:
Love this thread and it should be a sticky. I get pretty much the same results across the board as these when I chrono, except for the 64G Gold Dots for some reason. Don't know if I just have a hotter lot than Eagle or what, but I get ~150fps more out of the 64g GDs than he does with both my 14.5" and 11.5" rifles using the same suppressor as Eagle. I even tried it with 2 different Chronographs. |
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Originally Posted By Eagle_19er:
I got out this morning for the 11.5" barrel tests. Results in this post! There were a few surprises where velocity actually dropped on a couple of the loads but on most there was an increase with the 11.5" barrel. The Rifle: Parts build around an 11.5" Faxon Big Gunner Midlength barrel. LaRue MBT-2S trigger. Sico Omega suppressor. Cerakoted in Magpul FDE. https://www.AR15.Com/media/mediaFiles/23126/IMG-20170608-175346959-226101.JPG The Chronograph: MasterChrony, 12 feet from the muzzle. Atmospherics: Air Temp: 71-77 degrees Humidity: 41% Dewpoint: 54 degrees Pressure: 29.88 (steady) Elevation: 1030' The Results: I calculated average velocity, extreme spread and standard deviation using Excel. https://www.AR15.Com/media/mediaFiles/23126/SD-Ammo-226112.JPG https://www.AR15.Com/media/mediaFiles/23126/55-64gr-226113.JPG https://www.AR15.Com/media/mediaFiles/23126/Steel-226114.JPG |
Originally Posted By FloridaMan:
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Originally Posted By DiscipulusArmorum:
@Eagle_19er Looks like tinypic ate your ballistic tables. Originally Posted By DiscipulusArmorum:
@Eagle_19er Looks like tinypic ate your ballistic tables. Originally Posted By Huckelberry75: I noticed that as well. Kinda bummed. I sent the OP a PM asking if he still had them. Curious to see what happens. |
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I found this pretty fascinating. I recopied the data into another spreadsheet so I could extrapolate a bit more.
on average 10.5" to 11.5" gets you 100fps, and same with 11.5" to 12.5" 12.5" to 14.5" only gets your 70fps over 2 inches If I remove the ball ammo, the AVG differences change to 66, 103, 34 If I remove all the heavier rounds (anything higher than 62) the averages stay about the same Long before I saw this sheet I was planning on changing my 11.5 to a reflex style 12.5, and my 18" to a reflex style 14.5 perm I am going to be changing my 11.5 to 12.5, but the 14.5 seems pretty stupid now It would be awesome to see this continued out to 16", 18", and 20" 
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Thanks @cj3waker. I'll note that these tests weren't done in a lab. They were done in real world conditions with MY firearms on multiple days. As such, results will vary a little bit for other people. I did control for everything I could reasonably control for and conducted all four days of testing as identically as possible. |
Liberal: Give up your guns to prevent murder.
Gun Owner: Cut off your penis to prevent rape.
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Gun Owner: Thanks for proving my point.
Gun Owner: Cut off your penis to prevent rape.
Liberal: I'm not going to rape anyone!!!
Gun Owner: Thanks for proving my point.
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Originally Posted By Eagle_19er:
Thanks @cj3waker. I'll note that these tests weren't done in a lab. They were done in real world conditions with MY firearms on multiple days. As such, results will vary a little bit for other people. I did control for everything I could reasonably control for and conducted all four days of testing as identically as possible. I do think there is such a thing as faster barrels though. Faster twist, chrome lined, bigger gas port, button rifled will all slow a bullet down considerably |
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Originally Posted By SirSqueeboo:
We’re you able the test the MK318 ammo you got? |
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Originally Posted By sycotik1:
Bump. Can we make this one of those non-archive threads if it falls to far? |
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Originally Posted By zombiegristle:
@Eagle_19er any plans to test M855A1?  
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Originally Posted By Eagle_19er: Don't have any. You have 40 rounds you're willing to pony up? |
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So I had a 16" faxon chopped down to 12.5 and and threaded all the way back to the gas block, it shoots like a dream, and is very quiet.
I tested 4 loads today in 11.5", 12.5", and 18" and was pretty disappointed in velocity increase between my 11.5 and 12.5 Ammo used was a 55gr reload pretty similar to most 223 55gr loads, Wolf gold, M193, and a mild 75gr hornady load ~5000ft, 45 degrees 11.5" faxon midlength suppressed 12.5" faxon midlength suppressed 18" larue midlength suppressed Load ---------- 11.5" ----- 12.5" ----- 18" 55gr reload -- 2579 ----- 2598 ----- 2912 Wolf Gold ---- 2690 ----- 2723 ----- 3002 M193 --------- 2935 ----- 3024 ------ 3286 75gr reload -- 2467 ----- 2517 ------ 2710 |
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Originally Posted By cj3waker: So I had a 16" faxon chopped down to 12.5 and and threaded all the way back to the gas block, it shoots like a dream, and is very quiet. I tested 4 loads today in 11.5", 12.5", and 18" and was pretty disappointed in velocity increase between my 11.5 and 12.5 Ammo used was a 55gr reload pretty similar to most 223 55gr loads, Wolf gold, M193, and a mild 75gr hornady load ~5000ft, 45 degrees 11.5" faxon midlength suppressed 12.5" faxon midlength suppressed 18" larue midlength suppressed Load ---------- 11.5" ----- 12.5" ----- 18" 55gr reload -- 2579 ----- 2598 ----- 2912 Wolf Gold ---- 2690 ----- 2723 ----- 3002 M193 --------- 2935 ----- 3024 ------ 3286 75gr reload -- 2467 ----- 2517 ------ 2710 Interesting that the hottest load, the M193, got 89 fps, more than any other gain. Might be that true 5.56 pressure ammo sees more bump from 11.5-12.5 than .223 does. |
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Originally Posted By SpyHawk: Interesting that the hottest load, the M193, got 89 fps, more than any other gain. Might be that true 5.56 pressure ammo sees more bump from 11.5-12.5 than .223 does. That seems to be the case when going from 10.5" to 11.5" too. |
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Originally Posted By BigNicholad: I have 10 rounds I would pony up for some sbr/AR pistol velocity test. There's no short barrel info on m855a1 anywhere. Been looking for hours. Maybe I'll do it? It would be interesting if the OP could do it using the same barrels at the same altitude. Even if the weather is different. |
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Originally Posted By SpyHawk: It would be interesting if the OP could do it using the same barrels at the same altitude. Even if the weather is different. I still have those barrels, but I'm afraid I don't have the time and by this summer when I do I'll be living at ~4000ft. |
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Gun Owner: Cut off your penis to prevent rape.
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Gun Owner: Thanks for proving my point.
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Liberal: I'm not going to rape anyone!!!
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Originally Posted By BigNicholad: I have 10 rounds I would pony up for some sbr/AR pistol velocity test. There's no short barrel info on m855a1 anywhere. Been looking for hours. Maybe I'll do it?  M855A1, The Best 5.56x45mm Round? Gel Test |
| Thank you Eagle_19er for this in depth time consuming $ eating report . I accidentally came across your post on a google search of what I can’t even remember. I read the entire thread and subscribed just because of all this information. So again thank you. I’ve got 500 of the Speer GD 75 grain to load and I’ve got another 500 of the Hornady 75 Grn BTHP. Two curious questions , on the 1st page you have a few ballistic tables out for the 77 gr OTM and the 62 Grn . Just curious if you had a ballistics table for the 75 grn GD , 2nd is what would the 75 Grn BTHP Hornady be closest cousin to simulating ballistic wise . Thank all for any information . I’ve reloaded and cast for handgun for 35 yrs . I built my 1st AR 3 yrs ago and got addicted to the build puzzles / Adult Legos . Anyway I’ve been collecting parts for a 10.5” build and may switch to 12.5” after this article . Great info and look forward to reading more on this site . |
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I have some extra rounds of M855A1, the 2011 loading that was hot and used bismuth. I have been looking for SBR info on M855A1 EPR used in barrels 10.5"-12.5", with and without suppressors. I couldn't punch through level 3 steel with the 10.5" barrel, really damn close but not quite. TCB, on YouTube, was able to punch through a LVL 3 plate with an 11.5" suppressed. I tried 10.5" suppressed and had no luck. Now I'm rocking an 11.75" and think I may have a shot but would be much happier if I could make it part of a comprehensive M855A1 EPR evaluation/analysis out of SBR's. As expensive as it may be, it's what's in my HD mag. I've searched high and low and haven't been able to find SBR/M855A1 information that I trust. I'd be happy to take the project lead or follow someone else's lead. This information being released to the public is long overdue. |
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Originally Posted By swampvol: Why has this not been made a sticky?? Preach |
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Originally Posted By DanoTii: OP Is the Hornady Black the SBR load? If so, do you have any subjective impressions (some significant 8-9bd claims were made) on the sound of the horandy black vs others? Neither of the Hornady Black loads in this series of tests were the SBR load. IIRC, I had a hard time finding a couple boxes for a reasonable price around that time frame. Sidenote: I'm floored that this thread is still getting comments! To those that want a sticky, how do we make that happen? Between running after a toddler, trying to keep a business afloat, fixing up and selling two houses and moving my family across half the country (MN to MT) a couple months ago, I haven't had much time to think about an encore. If ammo availability and prices get better I'll try to put something together in the next year or two. I'm unfortunately not going to hold my breath on that though. |
Liberal: Give up your guns to prevent murder.
Gun Owner: Cut off your penis to prevent rape.
Liberal: I'm not going to rape anyone!!!
Gun Owner: Thanks for proving my point.
Gun Owner: Cut off your penis to prevent rape.
Liberal: I'm not going to rape anyone!!!
Gun Owner: Thanks for proving my point.
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Originally Posted By Zhukov: No. It's already linked in the Ammo Forum FAQ #20 Lol, no one looks at that. It would be better served as a sticky and remove it from the FAQ. But whatevs, it’s your sandbox I’m just here to play in it. |
“Necessary? Is it necessary for me to drink my own urine? No, but I do it anyway because it’s sterile and I like the taste.” -Patches O’Houlihan
"I don't eff with poorsies."
-Mona-Lisa Saperstein
"I don't eff with poorsies."
-Mona-Lisa Saperstein
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Originally Posted By Luny421: Lol, no one looks at that. It would be better served as a sticky and remove it from the FAQ. But whatevs, it’s your sandbox I’m just here to play in it. The thread is also set so that it won't fall into the archives, so it's always available. |
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Everyone please read this carefully. Eric802 is correct. - DK-Prof, 1/27/15
Everyone please read this carefully. Eric802 is correct. - DK-Prof, 1/27/15
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Originally Posted By Luny421: Lol, no one looks at that. It would be better served as a sticky and remove it from the FAQ. But whatevs, it's your sandbox I'm just here to play in it. No one looks at stickied threads either. Ask me how I know. 
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Originally Posted By Zhukov: No one looks at stickied threads either. Ask me how I know. Originally Posted By Zhukov: Originally Posted By Luny421: Lol, no one looks at that. It would be better served as a sticky and remove it from the FAQ. But whatevs, it's your sandbox I'm just here to play in it. No one looks at stickied threads either. Ask me how I know. Did you tell them about the spread sheet yet? |
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Suppressed 5.56 SBR Velocity Tests--41 Factory Loads from 10.5", 11.5", 12.5" & 14.5" ALL DONE! (Page 5 of 6)
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