We recently rebuilt our range using steel baffles. AR500 steel 1/2" thick will stop a .470 NE 500 gr. solid at 10 ft. We had it tested at White Laboratories. Setting the steel at an angle with a sand pit under it should work. We have 2" of recycled rubber bonded to ours. The steel and rubber can be purchased from Range Systems.
this is what we are going to do. Angle the plate by 30-35 degrees down so the bullets go down into a sand pit. A 1 inch thick by 36" x 36" width/lenght plate is 400 pounds, I would surely rather have to deal with 1/2 plate at 200
