The following is a chart showing Gauge, Caliber, and the weight of a pure lead ball for some of the more common 18th century muzzleloaders.



Gauge
(Bore)
Approx. Caliber
(in)
Weight of Pure lead Ball
(oz)
Weight of Pure lead Ball
(gr)
11 0.75
14 0.693 1.143 500
20 0.615 0.8 350
24 0.579 0.667 292
28 0.55 0.571 250
32 0.526 0.5 219
67½ 0.41 0.237 104

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