gun barrel caliber = 0.000254 length (length)
Try converting from "caliber" to angstrom, astronomical unit, city block (informal), digitus (Roman digitus), earth to moon (mean distance earth to moon), en (typography en), fathom, fermi, French, gradus (Roman gradus), Greek palm, Israeli cubit, league, light yr (light year), micron, Roman cubit, rope, soccer field, stadium (Roman stadium), UK mile (British mile), or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .14 agate (typography agate), 2,540,000 angstrom, .00000434 arpentlin, .00055556 Biblical cubit, .00000694 bolt (of cloth), .00111111 cloth quarter, 6.61E-13 earth to moon (mean distance earth to moon), 1.45 en (typography en), .00000278 football field, .00109769 Greek span, .00045872 Israeli cubit, .0001199 ken (Japanese ken), .000254 m (meter), 6.02E-09 marathon, .00000926 naval shot, .06 pica (typography pica), 6.47E-08 ri (Japanese ri), .00004167 rope, .00083333 survey foot, .00030312 vara (Mexican vara).
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