I built a plywood box, approx 2' by 2' with an angled back (I based my design off the metal one in the link below, but made it larger and deeper) and within the roof of the box set about halfway from the front, I installed a rod with alligator clips attached that I can hang typical mail order catalogs from. I just print out targets online to attach to the front of the catalogs. Before this I used a commercial steel pellet trap and the impact was louder than the gun itself. The catalogs are easily replaced when they get shot up. I've used this setup in the backyard and a garage and almost never have a pellet get through the magazines and haven't had any ricochets outside the box.
http://www.sportsmanswarehouse.com/...DIIXEaAleE8P8HAQ&kpid=prod9999005907
