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The difference is in the measurement system. Just as with miles vs. kilometers, pints vs. liters, etc, the United States continues to cling to the imperial measurement system, and cartridge calibers that were developed in the United States still bear the imperial measurements.

When decimal numbers are used to describe the caliber of a firearm, for example .45, .380, .22, etc. These are quoted as fractional inches. The barrel bore of a .45 caliber firearm is .45 inches across. European-designed cartridges are quoted using the metric system, as in 9mm, 5.56mm, 7.62mm, etc. The measurement still refers to the internal barrel diameter.

This likely will never change. Once the cartridges get their names, the names stick.

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15y ago

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