The result of your conversion between newton meter and grain/gallon [US] appears here
To convert between Newton Meter and Grain/gallon [US] you have to do the following:
First divide 1 / ((0.45359237/16)*(192/175)/480)/0.0037854118 = 58.41783141
Then multiply the amount of Newton Meter you want to convert to Grain/gallon [US], use the chart below to guide you.
Symbol: Nm
No description
Symbol: gr/gal
No description