The result of your conversion between grain/cubic foot and pound/cubic mile appears here
To convert between Grain/cubic Foot and Pound/cubic Mile you have to do the following:
First divide ((0.45359237/16)*(192/175)/480)/((0.0037854118/231)*1728) / 0.45359237/(((0.0037854118/231)*1728*27)*5451776000) = 21028278.85714286
Then multiply the amount of Grain/cubic Foot you want to convert to Pound/cubic Mile, use the chart below to guide you.
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