I kind of drink the "doesnt matter, all pistols calibers suck" kool aid. I mean aside from some nasty bear calibers (454cas, 460sw) all pistol cals are garbage compared to even a tiny .223 round.
With that said, I shoot a 45 with 10 round capacity because while it is well documented that 9mm expands, I have never seen a 45 shrink. Also there is a huge kinetic energy benefit with 45, 45 damages objects in a much more obvious way, tree branches, propane cyls, even steel. I have seen 9mm fmj bounce off steel at IDPA matches and never had that happen with my 40 or 45. I know there are many variable at play here, but I enjoy the recoil pulse of the lower pressure stuff.
I could see myself getting into 9mm with some 147grain HP ammo, would be nice to be rocking a gun with almost 20 bullets. But here in cali, I only get ten, so they will be the biggest I can find and still reasonably carry.

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