steel plates, paper, old cars, tin cans, aerosol cans, skoal cans, empty shotgun shells, bowling pins, anything else that I can find laying around and manage to drag out to the range
Paper targets, cans, shotgun shells, tree stumps. Hope to get some bowling pins - heard they work well, and would like to get a couple of spinner targets for plinking with the .22.
eggs, light a candle and shoot the flame, "strike anywhere" wooden matches (try to light them). tack some roofing nails into a board and try to drive them in.