I was at the neighbors with some of the other guys on the street and one brought up the question about Self defense calibers. My neighbor went in the garage and brought out a sledge hammer, baseball bat and a steel bar. He asked witch one would be better to hit someone with keeping in mind that the blow will be placed precisely on the side of the head and struck with as much force as possible. The guy looked at him for a second and said, "so placement trumps caliber?".