I tried a piece of armor plate for shooing offhand with my 22 at 100 yards, but it deadens the sound and is too heavy to move much, so I don't know if I hit or not. Can you recommend something about 8" diameter that makes noise and moves when you hit it with a 22 but doesn't get all shot up too quickly? Thanks. It's got to be circular because this is marksmanship instead of plinking.