"I found when I gutted it, I didn't actually have to fire that 2nd shot".
I have found that if its still on its feet, you have a chance of losing it. I lost one, that was shot in the chest, slid down hill for 30 yards, into the timber. Just prior to entering the timber It attempted to get to its feet, , and I never saw it again. I did not have a second shot, but I truly wish I had.