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How is caliber defined?

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Anonymous

8y ago
Updated: 8/20/2019

Caliber typically refers to the maximum diameter of a gun's barrel in hundredths of an inch.

Sometimes a stated caliber (like .38 Special) is not equal to its actual caliber (.357 caliber). This is due to several reasons:

1- Marketing,

2- Measuring barrel diameter land to land,

3- Measuring barrel diameter groove to groove.

4- Measuring diameter of the chamber (brass casing diameter).

Usually when a firearm uses millimeter instead of caliber, it tends to be a more accurate description of the projectile's diameter.

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Wiki User

8y ago

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