gun barrel caliber = 0.000254 length (length)
Try converting from "caliber" to archin (Russian archin), astronomical unit, bottom measure, chain (surveyors chain), digitus (Roman digitus), ell, fermi, foot, football field, furlong (surveyors furlong), ken (Japanese ken), light yr (light year), link (surveyors link), marathon, mil, nautical mile, pica (typography pica), Roman cubit, sazhen (Russian sazhen), UK mile (British mile), or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = 2,540,000 angstrom, .00035714 archin (Russian archin), .00055556 Biblical cubit, .00000116 cable length, .00111111 cloth quarter, .00000833 engineers chain, 254,000,000,000 fermi, .00083333 foot, .00013721 Greek fathom, .00329308 Greek palm, .00109769 Greek span, .00045872 Israeli cubit, .0001199 ken (Japanese ken), 2.68E-20 light yr (light year), 4.57E-08 nautical league, .00033333 pace, 6.47E-08 ri (Japanese ri), .00012077 sazhen (Russian sazhen), .00000231 skein, .00000137 stadia (Greek stadia).
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