Sounds like the boy has a little flinch or maybe is tugging on the trigger instead of squeezing. Take him out and let him practice some with a pellet rifle or a 22 and watch real close to see if you can figure out where the movement is coming from. Trigger control is the key to accurate shooting. Whether you shoot fast or slow, the speed with which you squeeze the trigger should be uniform throughout. I mean you dont speed up right at the moment of truth. Get him to practice dry firing some too, that might help. Good luck.