The result of your conversion between gram calorie and grain/cubic inch appears here
To convert between Gram Calorie and Grain/cubic Inch you have to do the following:
First divide 4.1858 / ((0.45359237/16)*(192/175)/480)/(0.0037854118/231) = 1.05855134
Then multiply the amount of Gram Calorie you want to convert to Grain/cubic Inch, use the chart below to guide you.
Symbol: g cal
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Symbol: gr/in³
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