This happened to me. A friend explained it had to do with the comb on my gun. It's a field gun Mossberg 500. If you aim (put the bead on the bird) It shoots low. When you lower your cheek to the stock your eye no longer is in line with the barrel. A scope would solve your problem,padding the stock at the comb or as my friend told me"put the bead on the bird(head)and then cover the bird(head) with the barrel. Worked for me yesterday the turkey dropped like a sack. That was a released bird at the club,season hereopens apr 10. hope this helps.