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Rabid Rich,
Welcome to the Forum. I checked the Lyman Black Powder Handbook for .50 caliber conicals. The .503" diameter is correct for the .50 caliber, but the heaviest loads listed are for a 370 grain conical on pages 111 to 115. The maximum loads for the 370 grainer were: 150 grains of C&H 3F on page 113 and 90 grains of G-O 3F on page 115. The starting loads were 45 grains for C&H and 50 for G-O Black Powder. Hope this helps.
Adam
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Adam Helmer
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