What is the least powerful gun that could "ethically" take a whitetail. Im guessing 357, would a longer barrel help with anything. Im also looking at getting a self defense weapon and the best circumstance would be a gun that could do double duty but im not sure about the 357 for self defense. I havent shot a 357 or any other pistol since I was 12 or so. Any of you hand gunners have any advice for the hunting, self defense or a double duty gun.