"I know you soil suckers will disagree,"

LOL got to remember that one liner.

Best advise is to parctise the shot and know for sure or be the bearer ofone of the many stories about how it got away.

Lets say though that you do get a shot and miss. There are enviromental factors that can be used in order for you to get a second chance. There was a rapid stream once that gave me that second shot. Deer started looking for something, but didn't know where to look, too late.Just saing don't be preprogramed to think that a missed shot is the end and while practising it's good to work on getting more than one off.

You can find the math behind what's going on with a search. Pretty interesting.