what these guys said

actually i don't put any pressure on the gun if i don't have to... one finger on the trigger... thumb lightly behind the receiver on top of the stock... left arm under the butt of the stock against the sandbag resting under the butt... if you get it all set up right the gun will jump on the front sandbag, you'll take most of the recoil and the gun will sit back down where it had been if you don't flinch or upset it's motion...
i am sure i could take a few lessons from Uncle Sam's training program for sure...
Jamie