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Posted: 3/27/2006 1:42:04 PM EDT
| I am on SLCPD S.W.A.T team, I want to know information on shorter barrel's, specifically 11". In my Job I am not a sniper and the longets shot I would ever have to take would be for qualifications and that is at 100 yds for operaters on team. The biggest question I have is , Will accuracey really be affected at 100 yds (not looking for a sniper score, meaning I dont care if I cant cover my hits with a quarter. Body hits are just fine). |
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Like mentioned before, bbl length does not affect accuracy. It does effect velocity though. Read the ammo oracle found here Scroll down to the part about ammo choice with short bbl AR15s. |
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Length of barrel has no bearing on the accuracy of the barrel. If you had a 24" barrel made by some hack idiot with all kinds of tolerance issues and a shitty crown it wont shoot, unless the target is 25" away!! All length has to do with is velocity and velocity has nothing to do with accuracy unless your bullet goes transonic which will destabilize it. 
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If terminal effectiveness was a consideration he would not be choosing a .223 poodle-shooter. The gun is going to be extremely loud, you might want to consider a silencer as not to damage your hearing or the hearing of others. |
Que? |
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suprises me how many people here still dont know that 5.56 ball is more effective than .308, 762x39, etc as long as it frags (2700fps). Your 11" bbl will do so to about 30yrds or so. Not to say you cant ruin someone's day at 100yrds with it though. 11.5 should be fine, with likely better accuracy ay 100yrds than even a 20". I would reccomend 14.5 or 16" though. With 16", you hardly lose any velocity compared to 20" |
HP's frag really nice at 20'. Check the proof target where you can see all the frag bits after it passed through a "wet media" (phone book soaked through). Note that the wet media doesn't really provide any useful data, but the proof sheet really shows that the 5.56HP round fragmented after impact. I shot this through a 14.5" barrel BM upper.   I did this test with 7.62x39 and 5.45x39 as well and those just tumbled and keyholed the proof sheet. |
maybe, but I haven't seen a rifle that fires 7.72 yet! 
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If it can't be killed with an 11.5, I doubt it could be killed with any 5.56mm weapon. I would be more concerned with getting one that ran 100%, as the shorties are a touch more finicky. I'd call Ken Elmore at Specialized Armament and order up either an RO933 or an LE6933 depending on whether the boss said auto was OK or not. Since it's papered anyway, might as well have it, right? |
Wind does not effect accuracy! Guns at Camp Perry dont become less accurate just because the wind picks up. Wind is an external factor in your example. If you shoot 5 rounds in the same wind and all the holes are close accuracy was not effected. Point of aim and impact are effected but if the impacts are all in the same place the barrel is still accurate. Secondly shooting a short barrel indoors while clearing a house, wind doesnt have any appreciable effect! 
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It is said that TAP is not a good choice because they use VMAX bullets, which were designed for varmints and have weak penetration. Some BH 77gr OTM would be a good choice. Edit because I type faster than I think |
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I have a Colt lower with a 20" 1/9 HBAR upper and a 11.5 1/9 HBAR upper To look at my 100 yard targets you can't tell what upper I was using!!! at 300 yards the 20" upper still keeps a nice tight grouping & the 11.5" upper is lucky to stay on paper!!! Under 100yds.... The 11.5" is tons of fun & VERY accurate!!! |
I meant their 75gr OTM. Loaded to NATO pressures, it's in their LE line... |
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