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As an experiment to investigate pellet spread, I bought a small box of 9mm shotshell ammo (1/8 oz, #12 shot) for my Sig-Sauer P6 (3 3/4 inch barrel). My target was a piece of insulating foam board. Results were a spread of about 1 foot at a distance of 10 feet. The spread seems large to me. Unless I scored a face hit, this seems to me to likely be more of an irritant to the midnight intruder than a deterrent. So, questions for the more knowledgeable: Is the spread due to rotation induced by the rifling, or are there other factors involved? Is using shot in a rifled barrel an exercise in futility? Thanks