It depends on the gauge and length of the shell, but common 12 gauge shells have between 25-45 grains of powder in.That range is determined by the wt. of shot/slug and the speed you want to shoot.In other word do you want to shoot trap at 1100 with 7/8Oz. shot or a goose upward of 1300fps with 1 1/4 Oz of shot.
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