I came across a DVD, "Bulletproof Legal Defense", that helps you survive the SD encounter and how to stay out of prison afterwards. It is presented by Peyton Quinn who has a couple of training sites. Anyway, he states that the ammo that causes the greatest hydrostatic shock (pressure) will be the most effect in neutralizing the threat, including handgun ammo. I found one of his websites and you can read it yourself and give your opinion. http://stresshooting.com/index.php?option=com_content&view=article&id=28&Itemid=86 Another thing I found interesting on the DVD was force on force training. The part that interested me was the BG was about 20 feet away when he pulls a knife and attacks. Even though the students knew it was going to happen, none could get a shot off before being stabbed.