Sorry, but echoing Casseres, you've demonstrated you know little to nothing about the legal use of lethal force in the US or practical self-defense with a gun. If you own a gun, please get a book like this classic http://www.amazon.com/In-Gravest-Extreme-Personal-Protection... before you end up being convicted of a serious crime.

Extending his remarks, if you hit the femoral artery in someone's upper leg, they're going to quickly bleed out unless they get serious first aid.