I don't want a fight here, this is just my opinion like many others here on these forums you have to take things with a grain of salt. Revolvers: .38spl, 357mag, if you like big bore then 44spl. Semi auto: 9mm, 40cal, 45acp. Which ever one you choose out of this batch I do believe for your personal protection while going about your daily business you should be fine. Before the .40cal the good guys where getting the job done with 9mm, .45acp. 5.7mm, 9mm, .357sig, .40cal, 45Gap, .45acp, 10mm? 10mm is good for Mountain Lion, and bear country so is .44mag Understand I am just talking about the two legged animal here. Ok, I choose three and focused on the semi-auto only for personal protection. I am only open to constructive comments only.