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| S&H 2-Bore Cartridge Case |
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Bore Number of a rifle barrel is equal to the numerical quantity of solid lead spheres of bore diameter which together weigh one pound (7000 grains). Bore and gauge are interchangeable as they relate to caliber. The density of pure lead used to calculate bore diameter is 11.34 grams per cubic centimeter. Given this density, a one pound sphere of lead would have a diameter of 1.67 inches the equivalent of 1-Bore.
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| 2-Bore Round Ball, 2-Bore FN Solid |
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2-Bore round ball, 3500 grain
1.326" diameter, 33.68 mm
4-Bore round ball, 1750 grain
1.052" diameter, 26.72 mm
6-Bore round ball, 1167 grain
.919" diameter, 23.34 mm
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Bore Number = 1÷ (R3÷ 9.55)
R = 1/2 caliber expressed in cm
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8-Bore round ball, 875 grain
.835" diameter, 21.21 mm
10-Bore round ball, 700 grain
.775" diameter, 19.69 mm
12-Bore round ball, 583 grain
.729" diameter, 18.56 mm
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