Before you can make any determination at all, you need to proper patterning.
The process is to shoot at a patterning board with a central target from 16 yards. 6 quick successive shots are suggested that way you can guage consistency of patterning over the multiple shots.
Then you must determine where the center of the shot concentration is. Note the vertical and horizontal variance of this point from the point you were aiming at.
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B. Dudley
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