This is an old debate but good to get people stired up....I prefer the 45acp...too many Jeff Cooper articals as a kid I guess. My wife likes her 9mm and I belive with HP and not FMJ this is a good self defense platform.....but Im intrested in the 40 cal...I dont know Jack about the 40 so I'll ask....Is the 40 as good as the 45acp for self defense? Better than the 45? or just some freakey new fly by noght round?