gun barrel caliber = 0.000254 length (length)
Try converting from "caliber" to archin (Russian archin), arpentcan, arpentlin, chain (surveyors chain), cloth finger, earth to moon (mean distance earth to moon), en (typography en), engineers chain, foot, Greek fathom, Israeli cubit, light yr (light year), link (surveyors link), ri (Japanese ri), Roman foot, Roman mile, soccer field, stadia (Greek stadia), UK mile (British mile), verst (Russian verst), or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = 5.74E-09 arpentcan, .00000434 arpentlin, 1.70E-15 astronomical unit, .00111111 cloth quarter, 1.45 en (typography en), .00000833 engineers chain, 254,000,000,000 fermi, .01142857 finger, .00000126 furlong (surveyors furlong), .00054885 Greek cubit, .00109769 Greek span, 5.26E-08 league, 3.94E-07 li (Chinese li), 2.68E-20 light yr (light year), 4.57E-08 nautical league, .00000926 naval shot, .06 pica (typography pica), .00012077 sazhen (Russian sazhen), .00000137 stadia (Greek stadia), 2.38E-07 verst (Russian verst).
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