The result of your conversion between gram/milliliter and grain/ounce [US] appears here
To convert between Gram/milliliter and Grain/ounce [US] you have to do the following:
First divide 0.001/0.000001 / ((0.45359237/16)*(192/175)/480)/(0.0037854118/128) = 456.3893079
Then multiply the amount of Gram/milliliter you want to convert to Grain/ounce [US], use the chart below to guide you.
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