gun barrel caliber = 0.000254 length (length)
Try converting from "caliber" to archin (Russian archin), arpentcan, bolt (of cloth), chain (surveyors chain), earth to moon (mean distance earth to moon), en (typography en), fathom, fermi, furlong (surveyors furlong), gradus (Roman gradus), Greek span, li (Chinese li), link (surveyors link), mile, nail (cloth nail), nautical league, naval shot, pace, parasang, pica (typography pica), or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .00035714 archin (Russian archin), 5.74E-09 arpentcan, .00055556 Biblical cubit, .00001263 chain (surveyors chain), .01369863 digitus (Roman digitus), 6.61E-13 earth to moon (mean distance earth to moon), .00013889 fathom, .00000278 football field, .0025 hand, .01 inch, 5.26E-08 league, 3.94E-07 li (Chinese li), 254 micron, .00000926 naval shot, 8.23E-21 parsec, .06 pica (typography pica), 6.47E-08 ri (Japanese ri), .00005051 rod (surveyors rod), 1.72E-07 Roman mile, .00027778 yard.
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