The result of your conversion between grain/gallon [US] and grain/cubic foot appears here
To convert between Grain/gallon [US] and Grain/cubic Foot you have to do the following:
First divide ((0.45359237/16)*(192/175)/480)/0.0037854118 / ((0.45359237/16)*(192/175)/480)/((0.0037854118/231)*1728) = 7.48051948
Then multiply the amount of Grain/gallon [US] you want to convert to Grain/cubic Foot, use the chart below to guide you.
Symbol: gr/gal
No description
Symbol: gr/ft³
No description