Got a good start on a pellet trap for the backyard today. 24" x 48". Shooting a Pro Sport .22 springer for now. Haven't decided if I'm going to cover the back with sheet steel and/or plywood and just stuff some bags of rubber nugget mulch in the back. I've seen folks hang that 1/4" thick rubber mat stuff as a curtain but I don't know where to find it. I need to call my local range and ask who their supplier is.