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The caliber of a firearm projectile is measured in thousandths of an inch. A .22 would be a actually be .223 of an inch for .22 rim fire, or .224 of an inch for such as a .223 Remington. A .9mm or a .380 Auto would be .355 of an inch. A .38 or .357 Magnum would measure .375 of an inch. A .40 S&W or a 10mm auto would measure .401 of an inch. Generally the larger the number the larger the caliber.

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Q: How do you tell what caliber is bigger?
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