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The diameter measurement of either a bullet or the internal width of a gun barrel. The caliber is usually measured in hundredths of an inch, for example .22, .38, and so on.
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"Interior of a 9mm pistol, March 23, 2011" by ArtBrom is licensed under CC BY-SA.
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References
References
Merriam-Webster Online
2015 Caliber. http://www.merriam-webster.com/dictionary/caliber, accessed April 14, 2015.