gun barrel caliber = 0.000254 length (length)
Try converting from "caliber" to archin (Russian archin), arpentcan, cable length, cloth finger, digitus (Roman digitus), earth to moon (mean distance earth to moon), fermi, finger, football field, Greek span, inch, league, nail (cloth nail), nautical league, parasang, ri (Japanese ri), skein, soccer field, sun (Japanese sun), survey foot, or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .00055556 Biblical cubit, .00000116 cable length, 6.61E-13 earth to moon (mean distance earth to moon), 1.45 en (typography en), 254,000,000,000 fermi, .01142857 finger, .00000278 football field, .00000126 furlong (surveyors furlong), .00034294 gradus (Roman gradus), .00054885 Greek cubit, .00013721 Greek fathom, 5.26E-08 league, 6.02E-09 marathon, 8.23E-21 parsec, .72270001 point (typography point), .00012077 sazhen (Russian sazhen), .00000138 stadium (Roman stadium), .00838223 sun (Japanese sun), .00030312 vara (Mexican vara), 2.38E-07 verst (Russian verst).
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