Basically, you want to ensure that the load you are shooting is accurate and that you are getting efficient pattern density. The easiest way is to take a piece of cardboard about 4' x 4', put a black dot in the center and step off a distance (20, 25, 30 yards) and line your beads up good and touch it off....you want the pattern to be centered at the dot and to have consistant density. It is key to try multible loads at different distances and find what loads performs the best overall.

Good luck