So as not to deform lead ammo I switched to a 3 inch square of black vinyl upholstry material. It lasts quite a while and if it's tied so it can swivel it swings around when hit so you know you hit it at ranges where it's hard to see. It's flimsy enough that you get no bounce outs. I've been killing tuna fish cans and if I hit them on the edge they deform my lead ammo...hence the switch. Unlike cans which deform and cut in two the black vinyl just stays the same until finally the attachment hole tears and it dies. Costs nothing, scraps given to me by an upholstery shop. Any flexible limp material will work, heavy cloth, leather, whatever. Just make a hole in it about 3/4 inch inside and tie a piece of stout cord through it and over a piece of bar or suspend it from a wire or cord...whatever works best for your catchbox. One could use old political campaign posters as well, a fitting target in most cases.