The result of your conversion between kiloton/cubic mile [US] and grain/gallon [US] appears here
To convert between Kiloton/cubic Mile [US] and Grain/gallon [US] you have to do the following:
First divide ((0.45359237*2000)*1000)/(((0.0037854118/231)*1728*27)*5451776000) / ((0.45359237/16)*(192/175)/480)/0.0037854118 = 0.01271436
Then multiply the amount of Kiloton/cubic Mile [US] you want to convert to Grain/gallon [US], use the chart below to guide you.
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