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Here is one method.  It is based on the volume of each barrel:


cubic in of the barrel for powder

.50 cal Divided by 2 = .25

.25(squarded) X .25 = .0625

.0625 X 3.1416 (Pi) = .19635

.19635 X 11.5 = 2.258 grain per cu in of bore

so it works out for a 32 inch barrel to 72.25 grains


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