the running man wrote:Get a great big sheet of card board put it up somewhere safe put a black mark in the center and aim at it and shoot it! Your pattern will tell you if your aim is off or if indeed you have a spread or pattern issue, I recommend a distance that is comfortable for you that you take clays or birds at......ide also try some 30 meter stuff too......
Use a roll of cheap "Lining Paper" and move it up just enough each time.