Are you patterning? Butcher paper works well.
When I pattern a shotgun, I start at my closest reasonable range and then do what I call a walk-back. Let's say I start at 20 yards. Once I pattern a few shots at 20 yards, I'll walk back to 25 yards then 30 then 35 .... You get the idea.
Knowing the pattern of your shotgun is essential if you plan to shoot it effectively. I've shot the head off of pheasants at 20 yards, leaving the rest of the body virtually untouched, when hunting pheasant preserves with my buddies. Not only does it save the meat, it leaves my buddies pretty impressed! :mrgreen: