I empty my mag when I take a deer. Once he's down, I keep shooting till he's dead. I am not tracking. Wondering in circles around the woods. The deer is down for good. The rest of you guys will be knifing your deer to death. Or poking him in the eye to see if there is still movement. While I'm field dressing.
And the best part is: if you fire 4 rounds in the woods, other hunters come over to see what's going on. They think you shot a bear. So hey, while they are there, they help you drag out your deer. Works like a charm