gun barrel caliber = 0.000254 meter (length)
Try converting from "caliber" to archin (Russian archin), arpentcan, astronomical unit, chain (surveyors chain), engineers chain, foot, football field, furlong (surveyors furlong), gradus (Roman gradus), Greek span, ken (Japanese ken), link (surveyors link), pica (typography pica), ri (Japanese ri), Roman foot, rope, sazhen (Russian sazhen), span (cloth span), vara (Mexican vara), yard, or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .00035714 archin (Russian archin), .00000434 arpentlin, 1.70E-15 astronomical unit, .03 barleycorn, .4 bottom measure, .00000116 cable length, .00000833 engineers chain, .01142857 finger, .00329308 Greek palm, 5.26E-08 league, .12 line, 6.02E-09 marathon, 1.37E-07 nautical mile, .00033333 pace, 4.51E-08 parasang, .06 pica (typography pica), 6.47E-08 ri (Japanese ri), .00004167 rope, .00083822 shaku (Japanese shaku), 2.38E-07 verst (Russian verst).
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