The result of your conversion between grain/gallon [UK] and gram/cubic millimeter appears here
To convert between Grain/gallon [UK] and Gram/cubic Millimeter you have to do the following:
First divide ((0.45359237/16)*(192/175)/480)/0.00454609 / 0.001/1.0E-9 = 0.00000001
Then multiply the amount of Grain/gallon [UK] you want to convert to Gram/cubic Millimeter, use the chart below to guide you.
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