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If I recall correctly, in the days of black powder cartridges specific rounds cited caliber and powder in grains, as in .45-70, .30-30, .50-70, etc. The nomenclature carried over to some modern loadings, but is meaningless in identifying the propellant charge.
Nowadays (except, I just learned, for reloaders) nobody needs to be concerned much with anything but the bullet weight in grains.
The International System Of Units defines a grain as 64.79891 milligrams, if anybody's interested.
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"Don't let macho be your epitaph."
---Ed Lovette
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