Hello and I know some of you well groan when you see this thread title as I imagine it's old hat and a long existing debate for many of you. However I just got my first 9 mm; I've been shooting 40 cal 4 about a decade as well as revolvers in 357. While I do not mind The Recoil at all from 40 cal and I'm used to shooting heavy revolvers like 454 Casull occasionally for hunting, so many folks out there have nine mm that I figured I'd get one at least for concealed carry. It just seems like 9 mm ammo would be around more both in stores and in the field with the possible exception of Rushes on ammo. So here's the inevitable question Which is better and why 9 mm or 40 cal?