By con­trast, ban­ning ammu­ni­tion mag­a­zines of more than 10 rounds, as Mr. Obama has pro­posed, would have a greater impact on so-​​called mass shoot­ings, where the killing effi­ciency of a lone gunman would be reduced, according to James Alan Fox, a pro­fessor at North­eastern Uni­ver­sity who studies crime.

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