I think we all can agree it does not matter between the 9mm 10mm .40 or .45 if you can't get a a good shot on the animal. Also with all the +p rounds that are out there and all the advancements in bullets all of them are capable of doing the trick. Use what your comfortable with. I always have my g17 with me when I go out I know it will take care of anything I could run into.