The result of your conversion between pound/cubic inch and grain/quart [US] appears here
To convert between Pound/cubic Inch and Grain/quart [US] you have to do the following:
First divide 0.45359237/(0.0037854118/231) / ((0.45359237/16)*(192/175)/480)/(0.0037854118/4) = 404250.
Then multiply the amount of Pound/cubic Inch you want to convert to Grain/quart [US], use the chart below to guide you.
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