I'm also left eye dominant and right handed. I started out at a gun club shooting .22s right handed, then after some reading I decided to shoot left handed. Still with right-handed bolt actions though. I can shoot with either hand just fine. I'm probably going to get a right-handed rifle when I get one, though, as there always seems to be a worse selection of left-handed guns. If he is left-hand dominant, though, I'd say introduce him to shooting with both hands and let him choose which is more comfortable for him.