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velocity-wise. it's not at all hard to get very close to typical 20" barrel velocity, with a good 14" barrel, and loads that are optimized, for velocity in that 14" barrel. 3" less barrel doesn't hurt velocity that much, either. 200 fps or so, tops, if the load is optimized for that 11" barrel.

223 SAAMI spec pressure is 48,000 CUP. 5.56 NATO spec is 55,000 CUP. Quite a difference in performance. The M855 Spec is 62 grs, 3050 fps, in a 20" barrel, and that's considerably hotter than factory 223 performance. It's also still a LONG ways from what is a max safe load in a good 5.56 autoloader. The fact that many are IGNORANT of this doesn't change it. It's STILL a fact. The Military match shooters are getting 2700-2800 fps, from 20" barrels, using 80 gr bullets, all the time, for 600 yd match shooting, and practice for same. Maybe you are stupid, and "think" you HAVE to shoot hot loads all the time in practice, but that's not the reality of the situation. Not at all.
 

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"t's not at all hard to get very close to typical 20" barrel velocity, with a good 14" barrel"

The Army has foubd that it cannot be done with a 14.5 inch barrel, but then what do they know?
 

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With your wonder weapons 11 inch barrel melvin your not even close to the performance of a 20 inch barrel, nor even a 14.5 inch barrel.If your wonder round was such a deadly deal the military wouldn't be letting it go.I've always hated the 5.56 rounds performance, and am glad to see the military is finally dumping it for a better round.Still not as good as a 308, but close enough.
 

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Gunkid are YOU saying the 5.56 MILITARY round for the AR-15/M-16 was optomized for 24 inch barrels? If you are, you are so FOS it must be coming out of your nose.

And gunkid, the CAR is a loser gun. It will never be worth a hoot for SHTF or general combat. It's so low in power you are better off with a 9mm carbine! At least with the 9mm you won't be kidding yourself about how effective it is.
 
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