The depth is about the same, but the wound channels
are a lot bigger with the 40.
I think the 40 is as good or better than the 45acp, especially if capacity is figured in.
9's arent on my radar unless its small.
Still don’t think I'd want a PM40 tho... the PM9 is a very nice shooting tiny 9mm, I think the same gun in a 40 would be rough to practice with.
I staunchly believe that 40 is the better round, but its limit is something like a Glock 27... no smaller than that for me thanks, and I'll take the G27 over the G26.