I bought one when they first came out and use if for everything from a .22 up to my 50cal and turkey guns. But instead of lead shot, which is very expensive, I found a huge chuck of steel in the scrap bin at work. It is about 2" thick and 6"X10". weighs about 25lbs I would guess. It does not get rid of all the recoil on the bigger guns, but greatly reduces it. My 50cal Knight with 120 grains of American Pioneer kicks about like a 243 in the sled.