IDPA 2/3 AR500 Steel 12" x 20" X 1/2" Shooting Target. Target Shape: 2/3 scale IDPA. 1/2” AR500 steel targets work great for the following calibers 223, 5.56, 5.45×39, 7.62×39 and 308. Handguns should be used no closer than 10 yards and rifles 100 yards.