The result of your conversion between ounce/gallon [US] and grain/ounce [UK] appears here
To convert between Ounce/gallon [US] and Grain/ounce [UK] you have to do the following:
First divide (0.45359237/16)/0.0037854118 / ((0.45359237/16)*(192/175)/480)/(0.00454609/160) = 3.28384744
Then multiply the amount of Ounce/gallon [US] you want to convert to Grain/ounce [UK], use the chart below to guide you.
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