BF4L
Bruins homer
No real specific reason so far. That's just what I've had in mind. I've shot the 9mm a few times and that's also a possibility, but the .40 seems a little more versatile as far as stopping power is concerned.
I'm a fan of the Hornady Critical Defense rounds in 9mm. If they don't stop whatever you shoot, you're fucked anyway.
I am a big fan of the 9mm especially with with Hornady Critical Defense rounds. I have them in my Glock 19.
Never bought into the "stopping power" argument very much. 9mm is a great round.