.223 ammo
There are some very good weapons/ammo guys who will come along in a bit and give the complete breakdown and a few links.
Not all weapons should fire the 5.56mm while anything that can fire the 5.56mm can fire the .223 round. The 5.56mm is usually loaded to produce higher pressures and a faster round. Check your weapon to be sure it's chambered for 5.56mm Nato or .223 Remington. Bushmasters should be all chambered for the 5.56mm.
Once you get into the 5.56mm you have 55 grain and 62 grain rounds. You'll find other terms like "green tip" British SS 109. Makers include Wolf, Silver Bear (?), Hornady, Remington, Winchester, Federal just to name a few.
I'm not too picky and will shoot the cheapest I can find as I just mainly plink out to 200 meters. Missfires? Only missfires I ever had was with some Egyption 8mm Mauser. Mixed lots and bulk packed.
The M4 has a short barrel and fails to get max pressure/speed out of standard military rounds.
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