12 ga,,,good choice, but I have been on the receiving end of a 410 shotgun,,,guess what,,it hurts, it really hurts. No, I was not hit in a vital spot, but let me tell you first hand, it would have killed me, (((( do not think for a moment that a 410 won't send an intruder to the promised land,,,it will)))) Head shot, face or chest,,,if u think a 410 is a sissy gun,,,have a buddy shoot you in the arm at 2o feet. It will make you cry and yell in pain...