I wonder which one puts the biggest holes in a 1957 Chevy body?
That ought to dispel any comments about which hits hardest.
Well let's see:
9mm bullet diameter is .355
.38 bullet diameter is .357
Maybe the '57 Chevy test media can tell the .002 of an inch difference in hole size?
I here 50 AE is the proper load for those! Or 600 Overkill if you have your rifle handy!