Right now I'm trying to decide between 45 ACP and 40 S&W for my first CCW. And there's one factor that I'm wondering whether I should consider or not. My friends and former friend use 45 ACP in 1911/Para Ord pistols. That means I can share ammo with 2 of my friends, including reloading equipment. But it also means the same caliber as a former friend... who is involved with my friend's teenage daughter, a situation that could get ugly if laws are broken or people pushed over the edge, and could involve insane actions and accusations. Now I'm not endeavoring to involve myself in the situation, but it's not something I can avoid 100% either. So the question of the day is whether it should affect my caliber choice. Another possible factor is that to a court 40 sounds more like a number than the name of a killer gun, like 45 Automatic Colt Pistol or 9mm Luger. Also more of a police caliber. I am fully confident in the capabilities of the 40. I had to think to conclude that 9mm wasn't enough, and 40 looks fine. That said, I'm well aware that 45 ACP has more knockdown power, and I am fully confident and capable in firing it. I've fired a Para and standard 1911 more effectively than any other kind. So do any of these reasons sound silly or incorrect?