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Prop your arm on a stable rest and aim at the paper target starting with a 25 yard distance. If it prints close to the bulls eye at this range, it will most likely hit the paper at 100 yards. Using the center shot to establish pattern, adjust to bring that shot to center at 100 yards using the same system. Usually the dials move in 1/4" increments up and down which will move you from point of impact to the correct point of impact.
It's best to let the barrel cool between shots to get a more accurate zero.