if i were to go with a semi-auto handgun for a camp gun, what caliber do you all think? 45 acp has a nice size, but slow bullet. 40 cal is obviously faster but smaller. i'm thinking it needs to be a credible threat to anything black-bear sized or smaller. got a chance at a good buy on a 45 or a 40 (within my wife's price range), and need help from the experts.