Caldwell AR500 Prairie Dog Target - Add some fun interactive targets to your range with these Caldwell AR500 Auto Resetting Targets. Constructed using AR500, the finest rifle rated target steel available on the market. The base of the frame sits 7--Inches off the ground. When the target is struck with a bullet it falls backward and is automatically reset with the integrated reset spring. For maximum life expectancy impact velocities of 3,000fps or below and impact energies of 3,500ft lbs or less are recommended.