Long shooting string and long coures of find man grip fatigue and I will see lapses in consentration has well. Some people just hold loosely. When they find the gun , the whole hand will close and the round tend to be low , sone completely below the traget and the traget frame .
We can rehabilitate those shooter as well as those who can't seem to get the trigger control thing doen by taping up the side. Often having to read the sigth while gripping the gun and manipulating a trigger is simply too much. Move them up to 3 or 5 yards, tack up and 8.5*11 ninch sheet of paper, and work on trigger and grip without sight. Simply taking the sight out of the equation can help in the shot term. Conversely, a negative traget can help. This is cutting a scoring circle out of traget, leaving one big hole.