I don't carry a 9mm, but if I did it'd be with 147gr ammo. Less flash and blast, better chance of adequate penetration if you get good expansion. I'm a heaviest bullet for the caliber guy in general. Only con to me is about 30% more weight in the magazine compared to 115 gr ammo. Placement, placement, and penetration are the three most important factors in handgun effectiveness, so IMHO carry what you shoot most effectively.