gun barrel caliber = 0.000254 length (length)
Try converting from "caliber" to arpentlin, astronomical unit, barleycorn, bolt (of cloth), cloth quarter, digitus (Roman digitus), earth to moon (mean distance earth to moon), engineers chain, French, furlong (surveyors furlong), Greek cubit, ken (Japanese ken), mil, naval shot, pace, parsec, soccer field, stadium (Roman stadium), UK mile (British mile), vara (Mexican vara), or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .00000434 arpentlin, .00055556 Biblical cubit, .00000278 city block (informal), .00222222 cloth finger, .01369863 digitus (Roman digitus), .00000833 engineers chain, .01142857 finger, .00083333 foot, .00034294 gradus (Roman gradus), .00013721 Greek fathom, .0025 hand, 1.58E-07 mile, .00333333 palm, .72270001 point (typography point), .00005051 rod (surveyors rod), .00057143 Roman cubit, 1.72E-07 Roman mile, .00004167 rope, .00000231 skein, 2.38E-07 verst (Russian verst).
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