If you had a 10mm, he'd bleed out the front and the back.45acp because its going to make a bigger hole for the BG to bleed out of quicker. This is real life not the movies. "Knockdown" and "Stopping Power" are nothing but marketing terms. A bad guy getting shot isn't going to go flying backwards. Most of the time he won't even know he is hit so thats why I carry the big fat 45. As many big holes as I can put in him and hope luck is on my side.