I use to shoot Skeet with a fellow who had his barrel bent so it patterned three feet high at the center post. He had a flinch and pulled the gun off his shoulder every time he pulled the trigger. On doubles he would pull the butt off his shoulder on the first shot, then remount the gun and pull it off again. Doing so made his point of impact three feet low at the middle post. I watched him bend a new gun barrel in between the slats of our fence to change his point if impact. He said with
a Browning he would slam the barrel down on top of two bags of shot. Browning barrels were very easily bent. He could also help straighten out a fellows bent barrel if it got bent by accident. Trap shooter have also been known to bend a barrel to change POI. More than one way to skin a cat.