One of the drills we use with my daughter, is I have a bore sight it is a sightmark I believe that is magnetic, this is attached to the barrel of an unloaded rifle, set up a target about 15-25 yards, when she pulls the trigger and uses good breathing and a smooth trigger pull the laser does not move on the target. When her breathing is off or her pull is jerked or is not smooth,the laser on the target will move, if the technique is real bad sometimes the laser sight would fall off of the barrel. This really helped her with the muscle memory and getting and keeping a sight picture., while pulling a rifle trigger. I do the same when I get a new rifle and/or new scope or if I change the scope of an existing rifle before I go out, and if I haven't gone to the range in a while. I am surprised how with my bad neck and back how I can use bad technique now if I don't check myself.