on that note, looking to do the same as far as a backstop. I'm just looking to do .22 with friends that come over and something to do myself. Looking to put it up against a hill on property for safety (don't you agree?). I'm afraid, even with the mentioned backstop, that someone aiming incorrectly would allow a bullet to go past the backstop. Common sense would be to shoot directly at the target with the backstop. If had to build a berm, how tall and wide?