I place a 6" square (white) in front center of an 18" circle (unpainted). I shoot this off of my patio with a .22lr at 165yrds. It simulates 500yrd high power rifle. Sighted in at 50yrds, there is 36" of drop, and ooohh-my the wind. By the sound I can tell the difference of which gong was hit.
