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Length/Distance | Convert from caliber to span |
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Common Length Conversions Metric Length Conversions Unit Definition (caliber) The caliber is a unit used to express the bore diameter of a gun. Traditionally, the diameter is stated in inches, so that ".22 caliber" refers to a pistol having a bore of 0.22 inches (5.588 mm). So the caliber is actually equivalent to the inch. The usage of the term "caliber" is actually now in decline, because bore diameters of many guns are now stated in millimeters. "Caliber" is the American spelling; elsewhere the unit is often spelled "calibre." Unit Definition (span) Span is the width of a human hand, from the tip of the thumb to the tip of the pinky finger.
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