I have never taken a head shot. But I can tell you that back in my centerfire days I once came across a doe who had no lower jaw. It was the end of opening day and she was bedded down and suffering big time. I was thankful that I was able to end it right there. It was one of the best kills I have ever made becuase I was able to end her suffering. This meant more to me than shooting a nice buck. I hope I never have the same opportunity again.