13 yds. will give you and idea of POI for your shotgun (high, low, left or right)of where you point with the mid bead and front bead making a figure 8 and place at 6 o'clock on the bullseye. 37-40 yds will give you your shotguns pattern using different chokes and shot sizes.
A 24" x 24" wide piece of paper will work at 13yds, you should have 42" -48" at 40 yds. Patterns at that range usually run 33" or less.
Last edited by jbmi; 12/29/11.
