Shooting is the answer. He is clearly "pulling" the trigger and anticipating the shot. Being prior service and shooting on a team for a few years, the best way to begin breaking this bad habit is to practice squeezing by dry firing while aiming at a target. Graduate to live fire and sqeeze again and not anticipate the shot but be "surprised" by the shot. I have a 257 and there is not any substancial recoil. LOL

"Semper Fi"