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Discussion Starter #1
Barrel lemgth is really critical in a .223 rifle. The .223 depends on bullet yaw and fragmentation which will not occur if rhe bullet's striking velocity is below 2,700-2,750 feet per second. The army found that the percentage offailores if the M4 carbine were significanly higher with M4 carbines (14.5 inch battrls than with M16A2 rifles (20 inch barrels). THey have seriously considered replacing the 14.5 inch M4 narrels with 16.5 inch barrels and will probably do that if the 6.8X43 (.270 caliber) cartridge cannot be adopted because of funding limitations. Army testing has shown that the 6.8mm is more effective than the .223 at all impact ranges.
 

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only if u r stupid enough to use a ball bullet,

and too lazy-inept to use reloads, set up for a given barrel length. u aint IN the military, u aint STUCK with ball ammo. Also, Hack says that they are gearing the Lake City M855 ammo towards better performance to the 14.5" M4 barrel. He says that some lots of the 62 gr ball ammo crack 3000 fps in the M4 barre. I know for a fact that Win 55 gr white box ball is 2650 fps in a certain 11.5" barrel, and that same gun has no trouble whatsoever getting 60 gr sp's to 2700 fps, using 27.0 grs of AA2520 powder, Winchester brass and primer. So you can ADMIT that you are too stupid, cheap and lazy to work up a decent reload, or you can retract what you've said above.
 

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the military's problems and solutions are not our problems

or solutions. The 6.8 forfeits the use of the .22 unit, and adds a lot of wt to the carry load, for no good reason.
 

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Hey gunkid/erika, remember reality?? The 14.5" barrel provides a nice game gun or urban rifle under 100 meters.

Out of my 14.5" Armalite M15A2 I chronoed the following;


Swiss GP 90, 62 grain FMJ: average MV 2746.8 & 2734.4 FPS

Cdn C77 Ball, 62 grain FMJ: average MV 2779.9 & 2846.7 FPS

Speer 62 grain FMJBT, 24.5 grains IMR 4895: 2647.1 & 2659.5 FPS

Hornady 68 grain BTHP Match, 24.5 grains IMR 4895: 2616.7 & 2605.5 FPS

Sierra 69 grain HPBT Match, 24.5 grains IMR 4895: 2586.8 & 2578.6 FPS

Remington 55 grain MC: 2856.2 FPS

Please detail your load data, cartridge case, primer, propellant, OAL, etc and the date you chronoed them. Or are you too lazy, inept, stupid and cheap to do it??
 

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andy said:
and too lazy-inept to use reloads, set up for a given barrel length. u aint IN the military, u aint STUCK with ball ammo. Also, Hack says that they are gearing the Lake City M855 ammo towards better performance to the 14.5" M4 barrel. He says that some lots of the 62 gr ball ammo crack 3000 fps in the M4 barre. I know for a fact that Win 55 gr white box ball is 2650 fps in a certain 11.5" barrel, and that same gun has no trouble whatsoever getting 60 gr sp's to 2700 fps, using 27.0 grs of AA2520 powder, Winchester brass and primer. So you can ADMIT that you are too stupid, cheap and lazy to work up a decent reload, or you can retract what you've said above.

Stop lying about what Hack says, you're totally FOS.

You tried that claim months ago and got hammered for lying then.
http://www.patriotnetwork.net/showthread.php?s=&threadid=16368

Lets just play fantasy land and pretend that your cheap Winchester White box ball ammuntion did get to 2650fps in one 11.5" barrel, you're already 50fps under the reliable fragmentation floor for M193 ball.

Why do you keep changing your AA2520 story johnny? Is it because you've been proven to have lied many times about it? Hmmmmmmmmmmmmm?

Here you are claiming 27.5grs =2800fps
http://www.patriotnetwork.net/showthread.php?s=&threadid=13536
and in the smae thread you claim that you can get 29grs in the case, too bad that was shown to be a complete and total 100% lie.
http://www.patriotnetwork.net/showthread.php?s=&threadid=17065
 

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Discussion Starter #6
The army tested 10, 11 and 12 inch barreled M16a in the XM177 pogram and rejected them due to inaccuracy, and poor ballistics with 55 grain bullets.
 

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As I posted here earlier about the test where they cut down a .223 barrel down to 10 inches, chronoing at every inch cut off, the 11" 5.56 is a POS. I can see the army finaly dawning on them that the cool looking 'commando' AR is looks only and a 16 inch barrel is the minimum for a military rifle. An 11" AR is not much better than a pistol cal. rifle. Simple as that. And gunkid, I PROVED it! Your fantacy is not based on facts, just looks.
 

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u aint IN the Army, stupid. The 10" barrel groups

FINE with HOrnady V max sp's and good handloads, scope, trigger job, etc. In fact, it groups 5" at 200 yds. :) That's TWICE as good as the .30 Carbine that you claim worked so well in Korea, old man.
 

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Discussion Starter #9
All right GunGeezer are you saying that you own a 10 inch or 11.5 inch AR15, have reloaded the bullet you describe, chronograoed it and shot it at 300 yards. Ot is this just another one of your keyboard fantasies?
 

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Post the source of your data gunkid/erika! Just saying it, doesn't mean that it is a fact.
 

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Garand, Hard Ball, gunkid has never posted links or any proof of what he says on this. I have posted several links to sites where they did chrono the 5.56 down to 10 inch barrel lengh. The 5.56 just loses so much and gives nothing in return when you have a barrel below 16 inches. I still prefer a longer one as you might need to shoot through something or use the round to destroy material, just two of the things the 5.56 does not do well with any load.

No, he dosn't have a 11" CAR or can or M21 or Star BM pos. He never had it as is ovious from what he says. He has no bug out gear either. It's all keyboard. No supprises here.
 
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