The result of your conversion between grain/gallon [US] and pound/gallon [UK] appears here
To convert between Grain/gallon [US] and Pound/gallon [UK] you have to do the following:
First divide ((0.45359237/16)*(192/175)/480)/0.0037854118 / 0.45359237/0.00454609 = 0.00017156
Then multiply the amount of Grain/gallon [US] you want to convert to Pound/gallon [UK], use the chart below to guide you.
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