according to one dip<font color=red>*</font><font color=red>*</font><font color=red>*</font><font color=red>*</font> here, because the barrel" cant" burn more powder.
That's his "reason" why a 10" 223 "cant' get more velocity than a 10" 221 fireball.
What a bunch of ignorant jerks "think" they "know" guns and ammo(much less shooting).