gun barrel caliber = 0.000254 length (length)
Try converting from "caliber" to actus (Roman actus), agate (typography agate), arpentcan, barleycorn, bolt (of cloth), bottom measure, earth to moon (mean distance earth to moon), ell, finger, gradus (Roman gradus), Greek fathom, li (Chinese li), marathon, nautical league, nautical mile, point (typography point), rod (surveyors rod), rope, UK mile (British mile), vara (Mexican vara), or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .00035714 archin (Russian archin), 5.74E-09 arpentcan, .00055556 Biblical cubit, .01369863 digitus (Roman digitus), .00022222 ell, .00013889 fathom, .01142857 finger, .00000126 furlong (surveyors furlong), 3.94E-07 li (Chinese li), .000254 m (meter), 10 mil, 1.58E-07 mile, .00000926 naval shot, .72270001 point (typography point), 6.47E-08 ri (Japanese ri), .00057143 Roman cubit, .00085822 Roman foot, 1.93E-08 spindle, .00000138 stadium (Roman stadium), .00838223 sun (Japanese sun).
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