My brother bought a Thompson contender 45-70 with a red dot scope. Was thinking about buying it from him to use as a brush gun next fall. Plus I think it would just be cool to kill a deer with a handgun. What is a good bullet grain to use for deer. I know its a little overkill but where I would be using it I'm only looking at shooting mature bucks anyway not small does or anything. What is your alls opinions and has anyone used a 45-70