A good lethal shot and good blood is for Bow Hunting in my mind. I dont want my bullet to leave have an exit wound. Id rather deer get all the shock and energy of the bullet. Less suffering that way.
I want my bullet to tear the hell out of the vitals (arteries, lungs, heart, backbone) AND make two holes. I want that critter to leak like crazy. I want a very good blood trail. Thing is, I want my bullet to make it into the heart/lung area of the deer from any angle.