Yes I am going to hang carpet, having trouble picking the right color LOL:). So far 1" plus sand is working. I caulked the bin area so I can shop vac and recycle the lead. While testing "no carpet and no sand" the pellets if shot at top 10" area of opening can bounce on the floor of bin (no sand) and make it out again about 1 in 30 chance, the pellet is spent and max only about 3 ft only so no danger really.
I did find that the lower front lip of the bin area at about 1/2 the height or more of the opening is best, making the bin area deeper helps prevent any ricochet (if any) from coming back at you :p Having fun, no ricochets and still testing, Tony.