Sorry, the boy was sitting across my knees and resting the foreend of the rifle on the window of the blind. An 18-20" drop at 50 yds or less is a pretty drastic pull. Without doing the math, I'm guessing that he would have to move the butt of the rifle up about 1-2" and I would have noticed that on the second shot. As a matter of fact, I was looking for that. Sitting at the bench 30 minutes later, rifle resting on bags, two shots low, the next shot dead on. I'm not thinking that it was the shooter.