The result of your conversion between pound/gallon [UK] and grain/quart [US] appears here
To convert between Pound/gallon [UK] and Grain/quart [US] you have to do the following:
First divide 0.45359237/0.00454609 / ((0.45359237/16)*(192/175)/480)/(0.0037854118/4) = 1457.17982926
Then multiply the amount of Pound/gallon [UK] you want to convert to Grain/quart [US], use the chart below to guide you.
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