of what i have learned of terminal balistics the M-16 has enough stoping power not by the size of the round but what it does when it finaly hits the target especialy if you hit bone.
you may have heard this before but this time it hold true.
Its not how big your gun is but how you use it!
we are taught to fire on disableing and fatal targets on the body
Marines: ONE shot one kill OOrA!'