re: 9 year old son. Right handed, left eye dominant.

I am a firearms instructor. I run across this quite often. All I can tell you is that I have never, ever, seen someone who is left eye dominant, even if they were right handed all of their life, shoot better right handed or with non-dominant eye. I have people argue with me about it all the time till I get them to shoot with their dominant eye and see for themselves it is better.

Do your son a favor and start him shooting with his dominant eye. He will be better for it.