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that result in a doughnut-shaped pattern of shot (with a high projectile density on the periphery, and a low projectile density in the interior). While this may be acceptable at close ranges (some spreader chokes are rifled to produce wide patterns at close range), this is not desirable at longer ranges, where a tight, consistent pattern is required to improve accuracy.Another smoothbore weapon in use today is the 37-mm riot gun, which fires less-lethal

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