i have always been told not to shoot 5.56 through a .223 also
the 5.56 has higher pressure and i think it is set at metric since it is the NATO ammo
also i do not think you can get a 5.56 in hollow point since using hollow points are banned by NATO
ORIGINAL: Pavomesa
There has alreadybeen a few zillion military rounds shot through all sorts of .223 caliber rifles. A little late to be telling anyone don't do it.
