Caliber of Cartridge-Please tell me what is meant by a cartridge known as a .56-52, or a .25-35-117, or any cartridge to which more than one number is given.
I am not certain regarding the double number rimfire cartridges, such as the .56-52, but I believe it means that the shell is .52 caliber at the mouth and .56 caliber at the head. Measurements will bear this out. The number represents the hundredth of an inch, so that the caliber of this cartridge would be 52 hundredths of an inch, or a little over one-half inch. In the center fire cartridges, and some rimfire, as the .22-7-45the first number represents the caliber, or diameter of the bullet in hundredths of an inch; the second figure means the number of grains of powder used in the cartridge; and the third represents the bullet, being its weight in grains. Thus a .25-35-117 means that the bullet measures 25 hundredths of an inch, in other words, 25 caliber; the powder charge is .35 grains, and the bullet weighs 117 grains. A cartridge is not always what it is named.
Harding, A.R.. 3001 Questions and Answers. Columbus, Oh: A.R. Harding, 1913.
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