The result of your conversion between ounce/gallon [UK] and grain/ounce [US] appears here
To convert between Ounce/gallon [UK] and Grain/ounce [US] you have to do the following:
First divide (0.45359237/16)/0.00454609 / ((0.45359237/16)*(192/175)/480)/(0.0037854118/128) = 2.84605435
Then multiply the amount of Ounce/gallon [UK] you want to convert to Grain/ounce [US], use the chart below to guide you.
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