Past 147072 Triple Spin Rimfire Target Action Targets The swingers and frame are made of durable high carbon steel to provide endless shooting fun. Please note that the 22 caliber triple spin was not designed to be used with the 17 HMR or 22 WMR rounds. Made from high carbon steel. Use only lead or lead nosed bullets. Always wear eye and ear protection. Do not allow spectators within 25 yards of the target.