gun barrel caliber = 0.000254 length (length)
Try converting from "caliber" to agate (typography agate), astronomical unit, chain (surveyors chain), city block (informal), cloth quarter, en (typography en), fathom, fermi, French, Greek fathom, hand, light yr (light year), micron, mile, nautical league, pace, parsec, pica (typography pica), point (typography point), rope, or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .14 agate (typography agate), 5.74E-09 arpentcan, .00000434 arpentlin, .00055556 Biblical cubit, .00000694 bolt (of cloth), .4 bottom measure, .00001263 chain (surveyors chain), .00222222 cloth finger, .01369863 digitus (Roman digitus), .00013889 fathom, .00000278 football field, .00054885 Greek cubit, .00013721 Greek fathom, .00045872 Israeli cubit, 5.26E-08 league, 2.68E-20 light yr (light year), 4.57E-08 nautical league, 1.37E-07 nautical mile, .00000926 naval shot, .00000231 skein.
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