Bullets are made of metals with different densities.
1 grain = 0.0648 grams
1 gram = 15.43 grains
1 cubic inch = 16.387 mL
1 mL = 0.061 cubic inch
grains per cubic inch =
= 252.8858 * (grams per cc)
grams per cc =
= 0.003954 * (grains per cubic inch)
