gun barrel caliber = 0.000254 length
Try converting from "caliber" to actus (Roman actus), agate (typography agate), barleycorn, chain (surveyors chain), city block (informal), cloth finger, cloth quarter, engineers chain, foot, Greek fathom, line, marathon, nautical league, palm, Roman mile, rope, shaku (Japanese shaku), span (cloth span), stadia (Greek stadia), stadium (Roman stadium), or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .00000716 actus (Roman actus), .14 agate (typography agate), 2,540,000 angstrom, .00035714 archin (Russian archin), .00055556 Biblical cubit, .00000116 cable length, .00001263 chain (surveyors chain), .00000278 city block (informal), .00222222 cloth finger, 1.45 en (typography en), .00000833 engineers chain, .00013721 Greek fathom, .0025 hand, .01 inch, 5.26E-08 league, 2.68E-20 light yr (light year), 6.02E-09 marathon, 4.57E-08 nautical league, .00000278 soccer field, .00000138 stadium (Roman stadium).
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