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This is a down and dirty answer, but in the late 1800s and early 1900s it was common to list calibers by the dimention of the bore and then the amount of powder in grains after it; can't remember why (find a good book on firearms history) so a 45/70 was actually .45 inches diameter and the 70 was amount of grains of powder. Same with .30/40 Krag etc. Now days you need to refer to a reloading manual to see what bullet weight goes with what powder as the wrong combination can be deadly. So with that in mind the 30/30 translates into .30 caliber with 30 grains of powder, and that has just stuck over the years. But look at a modern reloading book for anything other than this info.

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16y ago

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