A grain is equal to 65mg. So, 10 grains is equal to 650mg.
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16.1997275 milligrams
30 milligrams is less than half of one grain. to be exact, 0.462970 grains.
1 grain = 64.891mg, therefore 150 grains is: 150 x 64.891mg = 9,733.65mg
I would have to say half a miligram - one miligram at the most.
1,000 milligrams = 1 gram about 450 grams = 1 pound So about 450,000 milligrams in 1 pound. Of the choices you listed, the best match for a grain of salt has to be 1 milligram.