gun barrel caliber = 0.000254 meter (length)
Try converting from "caliber" to barleycorn, cloth finger, earth to moon (mean distance earth to moon), ell, engineers chain, fermi, finger, foot, football field, inch, m (meter), mil, pace, ri (Japanese ri), Roman cubit, Roman foot, Roman mile, span (cloth span), stadia (Greek stadia), UK mile (British mile), 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, .03 barleycorn, .4 bottom measure, .00000116 cable length, .00001263 chain (surveyors chain), .01369863 digitus (Roman digitus), 254,000,000,000 fermi, .01142857 finger, .762 French, .00034294 gradus (Roman gradus), .00054885 Greek cubit, .0025 hand, 3.94E-07 li (Chinese li), .00126263 link (surveyors link), 254 micron, .00000926 naval shot, .00085822 Roman foot, .00004167 rope, .00027778 yard.
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