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Posted: 3/14/2015 12:29:39 PM EDT
So , I couldn't find much in the way of good charts. [AR platform,5.56 NATO ammo,62 gr,SS109 etc]
From what I have gathered , it seems that there is a velocity drop of about 20% in feet per second ,when going from a 16 inch barrel to a 7 inch. Also , it looks like about a 10% drop when going from a 10 inch to a 7 inch barrel. Sound about right to you guys? Ive never had an SBR under 10 inches, but picked up a nice Sig516 piston upper in 7 inches yesterday. I figured this is the best place to ask about pistol length barrels on ARs. |
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Why is there a dip at 21"? Is that because of a rifle length gas system vs mid vs pistol? Stupid question probably.
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Hmmn, I'm not sure either, but here is where that graph came from, it's the first link in thread posted under the graph http://www.dtic.mil/ndia/2010armament/WednesdayCumberlandPhilipDater.pdf
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I'd say it's about powder burn. If you could use a faster burning powder, you could probably recoupe some of that loss. But with standard 5.56, I chose 10.5".
BCM decided not to even make any barrels shorter than... 11"? Just because of reliability issues in that last inch down to 10.5", even though they know there would be a huge market for their 10.5" barrels/uppers. But this is for DI AR's, not piston guns. As far as velocity goes and % drops.... if you really care to know, chrono your gun with the ammo you usually use, then calc it out. You'll get a accurate-enough readout on ft/lb force and trajectory. The 10.5" should still have as much energy/force at 300yd as .44 mag at the muzzle. The bullets aren't bouncing off your target just because it's a pistol, which some in the community still don't realize. |
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I'd say it's about powder burn. If you could use a faster burning powder, you could probably recoupe some of that loss. But with standard 5.56, I chose 10.5". BCM decided not to even make any barrels shorter than... 11"? Just because of reliability issues in that last inch down to 10.5", even though they know there would be a huge market for their 10.5" barrels/uppers. But this is for DI AR's, not piston guns. As far as velocity goes and % drops.... if you really care to know, chrono your gun with the ammo you usually use, then calc it out. You'll get a accurate-enough readout on ft/lb force and trajectory. The 10.5" should still have as much energy/force at 300yd as .44 mag at the muzzle. The bullets aren't bouncing off your target just because it's a pistol, which some in the community still don't realize. View Quote My tests with different commercial rounds show right around 300 fps average loss between 16" and 10.5". - OS |
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My tests with different commercial rounds show right around 300 fps average loss between 16" and 10.5". - OS View Quote View All Quotes View All Quotes Quoted:
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I'd say it's about powder burn. If you could use a faster burning powder, you could probably recoupe some of that loss. But with standard 5.56, I chose 10.5". BCM decided not to even make any barrels shorter than... 11"? Just because of reliability issues in that last inch down to 10.5", even though they know there would be a huge market for their 10.5" barrels/uppers. But this is for DI AR's, not piston guns. As far as velocity goes and % drops.... if you really care to know, chrono your gun with the ammo you usually use, then calc it out. You'll get a accurate-enough readout on ft/lb force and trajectory. The 10.5" should still have as much energy/force at 300yd as .44 mag at the muzzle. The bullets aren't bouncing off your target just because it's a pistol, which some in the community still don't realize. My tests with different commercial rounds show right around 300 fps average loss between 16" and 10.5". - OS Matches up with the accepted standard that there's usually 50fps change per inch of barrel changed. Lol |
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Matches up with the accepted standard that there's usually 50fps change per inch of barrel changed. Lol View Quote View All Quotes View All Quotes Quoted:
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I'd say it's about powder burn. If you could use a faster burning powder, you could probably recoupe some of that loss. But with standard 5.56, I chose 10.5". BCM decided not to even make any barrels shorter than... 11"? Just because of reliability issues in that last inch down to 10.5", even though they know there would be a huge market for their 10.5" barrels/uppers. But this is for DI AR's, not piston guns. As far as velocity goes and % drops.... if you really care to know, chrono your gun with the ammo you usually use, then calc it out. You'll get a accurate-enough readout on ft/lb force and trajectory. The 10.5" should still have as much energy/force at 300yd as .44 mag at the muzzle. The bullets aren't bouncing off your target just because it's a pistol, which some in the community still don't realize. My tests with different commercial rounds show right around 300 fps average loss between 16" and 10.5". - OS Matches up with the accepted standard that there's usually 50fps change per inch of barrel changed. Lol Except that it can't possible be linear, or you could chop a 20" barrel down to just the chamber and still be at about 2,200 fps. |
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I'd say it's about powder burn. If you could use a faster burning powder, you could probably recoupe some of that loss. But with standard 5.56, I chose 10.5". BCM decided not to even make any barrels shorter than... 11"? Just because of reliability issues in that last inch down to 10.5", even though they know there would be a huge market for their 10.5" barrels/uppers. But this is for DI AR's, not piston guns. As far as velocity goes and % drops.... if you really care to know, chrono your gun with the ammo you usually use, then calc it out. You'll get a accurate-enough readout on ft/lb force and trajectory. The 10.5" should still have as much energy/force at 300yd as .44 mag at the muzzle. The bullets aren't bouncing off your target just because it's a pistol, which some in the community still don't realize. View Quote While I don't disagree with your point, I'm not sure what numbers you are talking about. 44 mag 240gr 1500fps from a 7.5" barrel = 1200 ft/#. And they also get much better from there with longer barrels. A 65gr 5.56 needs to be going ~2900 fps for that to happen at the muzzle much less 300 yards. Nothing against 5.56 pistols, and maybe the loads I'm looking at are not considered by all to be representative. But you have to also give .44 more credit than that as if you put it through a carbine it gets closer to 2000 fps. 1500fps from a 10" barrel is easily obtained with commercial ammo. |
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Except that it can't possible be linear, or you could chop a 20" barrel down to just the chamber and still be at about 2,200 fps. View Quote View All Quotes View All Quotes Quoted:
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I'd say it's about powder burn. If you could use a faster burning powder, you could probably recoupe some of that loss. But with standard 5.56, I chose 10.5". BCM decided not to even make any barrels shorter than... 11"? Just because of reliability issues in that last inch down to 10.5", even though they know there would be a huge market for their 10.5" barrels/uppers. But this is for DI AR's, not piston guns. As far as velocity goes and % drops.... if you really care to know, chrono your gun with the ammo you usually use, then calc it out. You'll get a accurate-enough readout on ft/lb force and trajectory. The 10.5" should still have as much energy/force at 300yd as .44 mag at the muzzle. The bullets aren't bouncing off your target just because it's a pistol, which some in the community still don't realize. My tests with different commercial rounds show right around 300 fps average loss between 16" and 10.5". - OS Matches up with the accepted standard that there's usually 50fps change per inch of barrel changed. Lol Except that it can't possible be linear, or you could chop a 20" barrel down to just the chamber and still be at about 2,200 fps. Exactly so. Folks often say "mass doubles energy, velocity quadruples it". Which is only true in the first case if velocity stays same, and in the second case if mass stays same. Otherwise, it is of course also a sliding scale. - OS |
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some of my chronograph numbers of some of my go to loads for my 18" SPR, you can see losses when shot through my BA 8". I have been spending a month or two developing loads just for pistol/sbr use, been learning a ton
10 feet off muzzle Barnes 53gr TSX-H335 18" 3079 fps.........1115 ft/lbs 8" 2283 fps.........613 ft/lbs HNDY 55gr H355 18" 3135 fps.........1200 ft/lbs 8" 2452 fps..........734 ft/lbs HNDY 55gr IMR 3031 18" 2648 fps.......856 ft/lbs 8" 1986 fps........481 ft/lbs Nosler 69gr CC HPBT AR Comp 18" 2876 fps.......1276 ft/lbs 8" 2332 fps........833 ft/lbs Nosler 77gr CC HPBT AR Comp 18" 2668 fps.......1216 ft/lbs 8" 2109 fps.......760 ft/lbs |
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While I don't disagree with your point, I'm not sure what numbers you are talking about. 44 mag 240gr 1500fps from a 7.5" barrel = 1200 ft/#. And they also get much better from there with longer barrels. A 65gr 5.56 needs to be going ~2900 fps for that to happen at the muzzle much less 300 yards. Nothing against 5.56 pistols, and maybe the loads I'm looking at are not considered by all to be representative. But you have to also give .44 more credit than that as if you put it through a carbine it gets closer to 2000 fps. 1500fps from a 10" barrel is easily obtained with commercial ammo. View Quote View All Quotes View All Quotes Quoted:
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I'd say it's about powder burn. If you could use a faster burning powder, you could probably recoupe some of that loss. But with standard 5.56, I chose 10.5". BCM decided not to even make any barrels shorter than... 11"? Just because of reliability issues in that last inch down to 10.5", even though they know there would be a huge market for their 10.5" barrels/uppers. But this is for DI AR's, not piston guns. As far as velocity goes and % drops.... if you really care to know, chrono your gun with the ammo you usually use, then calc it out. You'll get a accurate-enough readout on ft/lb force and trajectory. The 10.5" should still have as much energy/force at 300yd as .44 mag at the muzzle. The bullets aren't bouncing off your target just because it's a pistol, which some in the community still don't realize. While I don't disagree with your point, I'm not sure what numbers you are talking about. 44 mag 240gr 1500fps from a 7.5" barrel = 1200 ft/#. And they also get much better from there with longer barrels. A 65gr 5.56 needs to be going ~2900 fps for that to happen at the muzzle much less 300 yards. Nothing against 5.56 pistols, and maybe the loads I'm looking at are not considered by all to be representative. But you have to also give .44 more credit than that as if you put it through a carbine it gets closer to 2000 fps. 1500fps from a 10" barrel is easily obtained with commercial ammo. The configuration I used were whatever test barrels Hornady was using to test their ammo. I think 7.5" is a bit long for a revolver. Most people don't go past 6", with many sticking to 4" for a modern revolver. I think using a 7.5" or even 10' barrel to compare would just be to bolster the numbers a bit? |
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Except that it can't possible be linear, or you could chop a 20" barrel down to just the chamber and still be at about 2,200 fps. View Quote As I said, there's some powder burn factor, especially with your example... I think the 50fps thing was for 10 to 16", something like that. Maybe even 10 to 20". Not sure on that though. It helps address the constant questions on how much speed is lost going from X to X. Usually 16" down to 14.5". Just a constant question, or used to be. |
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The configuration I used were whatever test barrels Hornady was using to test their ammo. I think 7.5" is a bit long for a revolver. Most people don't go past 6", with many sticking to 4" for a modern revolver. I think using a 7.5" or even 10' barrel to compare would just be to bolster the numbers a bit? View Quote View All Quotes View All Quotes Quoted:
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I'd say it's about powder burn. If you could use a faster burning powder, you could probably recoupe some of that loss. But with standard 5.56, I chose 10.5". BCM decided not to even make any barrels shorter than... 11"? Just because of reliability issues in that last inch down to 10.5", even though they know there would be a huge market for their 10.5" barrels/uppers. But this is for DI AR's, not piston guns. As far as velocity goes and % drops.... if you really care to know, chrono your gun with the ammo you usually use, then calc it out. You'll get a accurate-enough readout on ft/lb force and trajectory. The 10.5" should still have as much energy/force at 300yd as .44 mag at the muzzle. The bullets aren't bouncing off your target just because it's a pistol, which some in the community still don't realize. While I don't disagree with your point, I'm not sure what numbers you are talking about. 44 mag 240gr 1500fps from a 7.5" barrel = 1200 ft/#. And they also get much better from there with longer barrels. A 65gr 5.56 needs to be going ~2900 fps for that to happen at the muzzle much less 300 yards. Nothing against 5.56 pistols, and maybe the loads I'm looking at are not considered by all to be representative. But you have to also give .44 more credit than that as if you put it through a carbine it gets closer to 2000 fps. 1500fps from a 10" barrel is easily obtained with commercial ammo. The configuration I used were whatever test barrels Hornady was using to test their ammo. I think 7.5" is a bit long for a revolver. Most people don't go past 6", with many sticking to 4" for a modern revolver. I think using a 7.5" or even 10' barrel to compare would just be to bolster the numbers a bit? A bit but it is still well less than half the energy since you are comparing at 300 yards to the muzzle. .44 mag from a 4" barrel (Fed. Hydra Shock) 1250 fps 240 gr from a 4" = 833 ft/lb http://www.ballisticsbytheinch.com/44mag.html vs. 10.5" 223 at 300 yards as you specified - http://www.m4carbine.net/showthread.php?105639-Getting-the-most-out-of-your-5-56-SBR-rifle-with-pricey-223-quot-hunting-ammo-quot |
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some of my chronograph numbers of some of my go to loads for my 18" SPR, you can see losses when shot through my BA 8". I have been spending a month or two developing loads just for pistol/sbr use, been learning a ton 10 feet off muzzle Barnes 53gr TSX-H335 18" 3079 fps.........1115 ft/lbs 8" 2283 fps.........613 ft/lbs HNDY 55gr H355 18" 3135 fps.........1200 ft/lbs 8" 2452 fps..........734 ft/lbs HNDY 55gr IMR 3031 18" 2648 fps.......856 ft/lbs 8" 1986 fps........481 ft/lbs Nosler 69gr CC HPBT AR Comp 18" 2876 fps.......1276 ft/lbs 8" 2332 fps........833 ft/lbs Nosler 77gr CC HPBT AR Comp 18" 2668 fps.......1216 ft/lbs 8" 2109 fps.......760 ft/lbs View Quote Nice to see some data with bullet weight comparisons. Thanks for posting this. |
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As I said, there's some powder burn factor, especially with your example... I think the 50fps thing was for 10 to 16", something like that. Maybe even 10 to 20". Not sure on that though. It helps address the constant questions on how much speed is lost going from X to X. Usually 16" down to 14.5". Just a constant question, or used to be. View Quote View All Quotes View All Quotes Quoted:
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Except that it can't possible be linear, or you could chop a 20" barrel down to just the chamber and still be at about 2,200 fps. As I said, there's some powder burn factor, especially with your example... I think the 50fps thing was for 10 to 16", something like that. Maybe even 10 to 20". Not sure on that though. It helps address the constant questions on how much speed is lost going from X to X. Usually 16" down to 14.5". Just a constant question, or used to be. I agree there, it's nit-picking for the common rifle lengths. But when people want a super-short pistol or SBR for serious use, the terrible ballistics of sub 10" barrels should probably point them to .300 or 6.8. A lot of guys are overestimating velocities from 7.5" guns. |
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Looks like you still get decent penetration (18") at 83 yards though.
http://www.activeresponsetraining.net/ar-15-pistol-ballistic-gel-testing |
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I know it's an older thread, lots better data but for a "real world" tidbit that may help:
I chronied some Wolf Gold the other day: For about 7-8 shot strings. 10.5" pistol 2550-2640 16" Dissipator(mid-length) 2996-3042 16" M4. 2980-2984 |
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depending on projectile, you can get good tings to happen in a 556 SBR with in reasonable range , and they usually beat rifles and carbines in penetration 53 gr Barnes 2283fps @ muzzle , 100 yards shot into water jugs using of a 8" 1:7 Ballistic Advantage 556 chamber.....wouldn't want to pull it out of my belly <a href="http://s45.photobucket.com/user/oli700/media/2a/image.jpg5_zpsgbshf9fa.jpg.html" target="_blank">http://i45.photobucket.com/albums/f60/oli700/2a/image.jpg5_zpsgbshf9fa.jpg</a> full weight retention, it weighed that when I loaded it <a href="http://s45.photobucket.com/user/oli700/media/2a/image.jpg2_zpslmevtl8f.jpg.html" target="_blank">http://i45.photobucket.com/albums/f60/oli700/2a/image.jpg2_zpslmevtl8f.jpg</a> View Quote View All Quotes View All Quotes Quoted:
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Except that it can't possible be linear, or you could chop a 20" barrel down to just the chamber and still be at about 2,200 fps. As I said, there's some powder burn factor, especially with your example... I think the 50fps thing was for 10 to 16", something like that. Maybe even 10 to 20". Not sure on that though. It helps address the constant questions on how much speed is lost going from X to X. Usually 16" down to 14.5". Just a constant question, or used to be. I agree there, it's nit-picking for the common rifle lengths. But when people want a super-short pistol or SBR for serious use, the terrible ballistics of sub 10" barrels should probably point them to .300 or 6.8. A lot of guys are overestimating velocities from 7.5" guns. depending on projectile, you can get good tings to happen in a 556 SBR with in reasonable range , and they usually beat rifles and carbines in penetration 53 gr Barnes 2283fps @ muzzle , 100 yards shot into water jugs using of a 8" 1:7 Ballistic Advantage 556 chamber.....wouldn't want to pull it out of my belly <a href="http://s45.photobucket.com/user/oli700/media/2a/image.jpg5_zpsgbshf9fa.jpg.html" target="_blank">http://i45.photobucket.com/albums/f60/oli700/2a/image.jpg5_zpsgbshf9fa.jpg</a> full weight retention, it weighed that when I loaded it <a href="http://s45.photobucket.com/user/oli700/media/2a/image.jpg2_zpslmevtl8f.jpg.html" target="_blank">http://i45.photobucket.com/albums/f60/oli700/2a/image.jpg2_zpslmevtl8f.jpg</a> Were you able to pull any of the 69 grain out of the water jug as well and the SBr thanks for posting your data it is very good |
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Were you able to pull any of the 69 grain out of the water jug as well and the SBr thanks for posting your data it is very good View Quote View All Quotes View All Quotes Quoted:
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Except that it can't possible be linear, or you could chop a 20" barrel down to just the chamber and still be at about 2,200 fps. As I said, there's some powder burn factor, especially with your example... I think the 50fps thing was for 10 to 16", something like that. Maybe even 10 to 20". Not sure on that though. It helps address the constant questions on how much speed is lost going from X to X. Usually 16" down to 14.5". Just a constant question, or used to be. I agree there, it's nit-picking for the common rifle lengths. But when people want a super-short pistol or SBR for serious use, the terrible ballistics of sub 10" barrels should probably point them to .300 or 6.8. A lot of guys are overestimating velocities from 7.5" guns. depending on projectile, you can get good tings to happen in a 556 SBR with in reasonable range , and they usually beat rifles and carbines in penetration 53 gr Barnes 2283fps @ muzzle , 100 yards shot into water jugs using of a 8" 1:7 Ballistic Advantage 556 chamber.....wouldn't want to pull it out of my belly <a href="http://s45.photobucket.com/user/oli700/media/2a/image.jpg5_zpsgbshf9fa.jpg.html" target="_blank">http://i45.photobucket.com/albums/f60/oli700/2a/image.jpg5_zpsgbshf9fa.jpg</a> full weight retention, it weighed that when I loaded it <a href="http://s45.photobucket.com/user/oli700/media/2a/image.jpg2_zpslmevtl8f.jpg.html" target="_blank">http://i45.photobucket.com/albums/f60/oli700/2a/image.jpg2_zpslmevtl8f.jpg</a> Were you able to pull any of the 69 grain out of the water jug as well and the SBr thanks for posting your data it is very good I did but didn't record it I did keep and record the 77gr HPBT if that helps 2109 fps 10 feet from the muzzle, shot 50 yards to impact |
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There's a Youtube guy named PoBoy Special that has quite a few tests of various ammo through a 7.5" 5.56 pistol, to include velocities and ballistic gel results.
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I did but didn't record it I did keep and record the 77gr HPBT if that helps 2109 fps 10 feet from the muzzle, shot 50 yards to impact <a href="http://s45.photobucket.com/user/oli700/media/2a/image.jpg3_zps4clzfgr5.jpg.html" target="_blank">http://i45.photobucket.com/albums/f60/oli700/2a/image.jpg3_zps4clzfgr5.jpg</a> <a href="http://s45.photobucket.com/user/oli700/media/2a/image.jpg4_zpspoprt2gv.jpg.html" target="_blank">http://i45.photobucket.com/albums/f60/oli700/2a/image.jpg4_zpspoprt2gv.jpg</a> View Quote very interesting stuff seems like most ballistics stuff you see is from a 16 inch barrel. I will start looking around more for 10.5 stuff and likely doing some testing of my own. I have like seeing milk jug stuff and like knowing it doesn't take expensive gel to get an idea. |
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very interesting stuff seems like most ballistics stuff you see is from a 16 inch barrel. I will start looking around more for 10.5 stuff and likely doing some testing of my own. I have like seeing milk jug stuff and like knowing it doesn't take expensive gel to get an idea. View Quote View All Quotes View All Quotes Quoted:
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I did but didn't record it I did keep and record the 77gr HPBT if that helps 2109 fps 10 feet from the muzzle, shot 50 yards to impact <a href="http://s45.photobucket.com/user/oli700/media/2a/image.jpg3_zps4clzfgr5.jpg.html" target="_blank">http://i45.photobucket.com/albums/f60/oli700/2a/image.jpg3_zps4clzfgr5.jpg</a> <a href="http://s45.photobucket.com/user/oli700/media/2a/image.jpg4_zpspoprt2gv.jpg.html" target="_blank">http://i45.photobucket.com/albums/f60/oli700/2a/image.jpg4_zpspoprt2gv.jpg</a> very interesting stuff seems like most ballistics stuff you see is from a 16 inch barrel. I will start looking around more for 10.5 stuff and likely doing some testing of my own. I have like seeing milk jug stuff and like knowing it doesn't take expensive gel to get an idea. right on , its does give you an idea .....after you do it a bunch you can compare, other than that don't know how it really translates to real life. I tend to try to figure out stuff for myself and use these places for info but once I kinda figured out a lot of people think 556 in SBR/pistol are "toys".......I had to prove to myself the truth, truth is they are not at all toys and I take mine very serious in 200 yards. I sight it in for 50 , it hits at 200 just like a full size AR.....after testing loads I know it is plenty accurate and lethal at 200 yards. Realistically its all I expect out of it and all it was built for |
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right on , its does give you an idea .....after you do it a bunch you can compare, other than that don't know how it really translates to real life. I tend to try to figure out stuff for myself and use these places for info but once I kinda figured out a lot of people think 556 in SBR/pistol are "toys".......I had to prove to myself the truth, truth is they are not at all toys and I take mine very serious in 200 yards. I sight it in for 50 , it hits at 200 just like a full size AR.....after testing loads I know it is plenty accurate and lethal at 200 yards. Realistically its all I expect out of it and all it was built for View Quote View All Quotes View All Quotes Quoted:
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I did but didn't record it I did keep and record the 77gr HPBT if that helps 2109 fps 10 feet from the muzzle, shot 50 yards to impact <a href="http://s45.photobucket.com/user/oli700/media/2a/image.jpg3_zps4clzfgr5.jpg.html" target="_blank">http://i45.photobucket.com/albums/f60/oli700/2a/image.jpg3_zps4clzfgr5.jpg</a> <a href="http://s45.photobucket.com/user/oli700/media/2a/image.jpg4_zpspoprt2gv.jpg.html" target="_blank">http://i45.photobucket.com/albums/f60/oli700/2a/image.jpg4_zpspoprt2gv.jpg</a> very interesting stuff seems like most ballistics stuff you see is from a 16 inch barrel. I will start looking around more for 10.5 stuff and likely doing some testing of my own. I have like seeing milk jug stuff and like knowing it doesn't take expensive gel to get an idea. right on , its does give you an idea .....after you do it a bunch you can compare, other than that don't know how it really translates to real life. I tend to try to figure out stuff for myself and use these places for info but once I kinda figured out a lot of people think 556 in SBR/pistol are "toys".......I had to prove to myself the truth, truth is they are not at all toys and I take mine very serious in 200 yards. I sight it in for 50 , it hits at 200 just like a full size AR.....after testing loads I know it is plenty accurate and lethal at 200 yards. Realistically its all I expect out of it and all it was built for I put hits on 66% steel plate at 500 yards with my 10.5 I am mostly worried about what the round is going to do when it hits. The 53 grain TSX rounds are one I want to get and start loading for my 10.5 and I like what they do in the target through a 16 inch barrel but wanted more on what they do out of a 10.5 with so much lost velocity. |
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I put hits on 66% steel plate at 500 yards with my 10.5 I am mostly worried about what the round is going to do when it hits. The 53 grain TSX rounds are one I want to get and start loading for my 10.5 and I like what they do in the target through a 16 inch barrel but wanted more on what they do out of a 10.5 with so much lost velocity. View Quote View All Quotes View All Quotes Quoted:
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I did but didn't record it I did keep and record the 77gr HPBT if that helps 2109 fps 10 feet from the muzzle, shot 50 yards to impact <a href="http://s45.photobucket.com/user/oli700/media/2a/image.jpg3_zps4clzfgr5.jpg.html" target="_blank">http://i45.photobucket.com/albums/f60/oli700/2a/image.jpg3_zps4clzfgr5.jpg</a> <a href="http://s45.photobucket.com/user/oli700/media/2a/image.jpg4_zpspoprt2gv.jpg.html" target="_blank">http://i45.photobucket.com/albums/f60/oli700/2a/image.jpg4_zpspoprt2gv.jpg</a> very interesting stuff seems like most ballistics stuff you see is from a 16 inch barrel. I will start looking around more for 10.5 stuff and likely doing some testing of my own. I have like seeing milk jug stuff and like knowing it doesn't take expensive gel to get an idea. right on , its does give you an idea .....after you do it a bunch you can compare, other than that don't know how it really translates to real life. I tend to try to figure out stuff for myself and use these places for info but once I kinda figured out a lot of people think 556 in SBR/pistol are "toys".......I had to prove to myself the truth, truth is they are not at all toys and I take mine very serious in 200 yards. I sight it in for 50 , it hits at 200 just like a full size AR.....after testing loads I know it is plenty accurate and lethal at 200 yards. Realistically its all I expect out of it and all it was built for I put hits on 66% steel plate at 500 yards with my 10.5 I am mostly worried about what the round is going to do when it hits. The 53 grain TSX rounds are one I want to get and start loading for my 10.5 and I like what they do in the target through a 16 inch barrel but wanted more on what they do out of a 10.5 with so much lost velocity. 25.5 gr H335, 1/10 grain over Barnes data. The cases show no preasure signs so I think I can work up a little from here and get a little more expansion out of the bullet 53 grain Barnes TSX -25.5gr H335- CCI 450- 2.190" OAL....2283fps from an 8" Ballistic Advantage barrel same load from my 18" spr......Minute of Pain |
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