A 12-gauge with a 3½-inch chamber can hold up to 2¼ ounces of lead shot, while a 3-inch 20 maxes out at 1 5/16 ounces. Even when you shoot 3-inch shells in a 12, the hull holds 1¾ ounces of ...

these 2 ¾-inch paper hulls contain 1 ¼-ounces of shot at 1330 fps in 12-gauge or an ounce at 1250 fps in 20-gauge. Both gauges offer the choice of hard, copper-plated lead in 4, 5, or 6 shot.