I would guess he is flinching/diving on the gun. you "load" the gun and hand it to him when you are at the range but when I say "load" it you say you put one in the chamber but dont. When he takes his shot you watch the gun and you will see him pull the trigger and flinch waiting on the recoil this will tell you what you want to know.
Alot of dry fire will help get the pull right then you will see him hit x or high for the first few shots then the rounds will drop again.
Just need more dry fire time and more .45 rounds down range..