W.I.M.P.,
That is my favorite shot, the back of the head execution style. In all honesty the best shot and only shot should be to take the air out of their sails. This year I did shoot a doe though about a week and a half ago at around 5-8 yards as she walked under my stand and away from me. I was up around 24 feet and I hit her square in the back of the head, the most humane and quick kill the animal could get. However this is a shot that should never be taken, and I am not proud to say I released an arrow. But most importantly in your shots you must be confident, and have lots and lots of practice under your belt.