Here's something to think about. If you are a responsible gun owner, you should be able to place a kill shot at will. Also a wounding shot or warning. I personally do not believe in warnings. I will try and be as polite as possible> dead men tell no lies.
You shoot to stop the threat. Not to wound and not to warn. We are not that good. Shooting to wreck and elbow or a knee is not a good idea. Ifa shot is warranted you shoot to stop the threat.