FYI The Champion Heavy Duty Metal Trap (PY-A-1026) that is $76 at Airgun Depot will handily stop and catch slugs from the .357 Challenger at 30 yards without denting the trap. Mind you, heavy as the trap is, I set mine on a milk crate and at 30 yards the slugs were so powerful they moved the trap, turned it a bit to the side once, and knocked it off the milk crate altogether after a few shots. No damage to the trap other than the normal marks where the slugs hit, but you will need to have it up against something firm or bolt it down if you ever want to use one of these to catch your Challenger lead.