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The diameter of the bullet that is fired, along with the dimensions of the cartridge that the gun will fire. For instance, the barrel may be the size for a bullet that is 32/100ths of an inch- but depending on the chamber dimension, that could be a .32 Auto, 32 S&W, or a 32-20. If the caliber is not known, then materials like Cerro-Safe are used to make a casting of the chamber, and the casting is measured with a micrometer.

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