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A Troy ounce is heavier because there are only 14.58333 Troy ounces in a pound whereas the "normal" (avoirdupois) ounces are 16 in a pound.

1 lb. = 16 oz. Avoirdupois

1 lb. = 7000 grains

1 ounce Troy = 480 grains

7000 / 480 = 14.58333 ounces Troy per 1 lb.

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14y ago

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