FrommerStop
Master
For above the berm to catch stray rounds I have seen people erect structures with the 3.5-4.5 inch space between two layers of plywood filled with gravel. At one range when tested it stopped standard 30-06 ball ammo and a 416 rem mag was mostly stopped with some fragments lodging in the other layer of plywood.All I needed was confirmation that I am in the “right” and I got it. I won’t be shooting until I make it more safe for me to shoot out there. I have sandbags That I will be putting up. 100 50# bags to be exact
I saw something like being used on the Monsanto range, but people had shot into it repeatedly and the gravel was spilling unto the ground. It is only meant to catch a stray or AD type round and not as a general backstop.