What I do is I cut a piece of tar paper, almost 4x8 and put a target in the middle. Than I go to the range and place that tar paper and target at the 100 yards range. Shoot gun and see where you are hitting the target. After shooting adjust the scope and continue shootin until you are satisfied. I do this for all my rifles, scoes or open sights. Tar paper is cheap and I have fun shooting them up.

Good luck....

Tomster