I would just distance yourself from him. What hes doing obviously bothers you to the point you want him in jail. I just can't see how hes even your friend.
Next time your shooting with him tell him you don't want to hear about illegally shot deer anymore. If you don't speak up he thinks you don't mind him doing it.
He might actually change his ways.
Think about it; you shoot a buck illegally, and you go to show all the guys at the ole' hunt club. If they all turned you away, next time you would think before you shot another illegal deer. It's the fear you won't be respected among your peers.