gun barrel caliber = 0.000254 meter (length)
Try converting from "caliber" to agate (typography agate), archin (Russian archin), bolt (of cloth), chain (surveyors chain), earth to moon (mean distance earth to moon), ell, engineers chain, fermi, football field, Greek span, Israeli cubit, line, micron, mil, naval shot, ri (Japanese ri), Roman cubit, span (cloth span), spindle, vara (Mexican vara), or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .00000716 actus (Roman actus), 5.74E-09 arpentcan, .4 bottom measure, .00013889 fathom, 254,000,000,000 fermi, .00083333 foot, .00045872 Israeli cubit, 3.94E-07 li (Chinese li), 2.68E-20 light yr (light year), .000254 m (meter), 254 micron, .00444444 nail (cloth nail), .00000926 naval shot, .00333333 palm, .00004167 rope, .00000231 skein, .00000278 soccer field, .00030312 vara (Mexican vara), 2.38E-07 verst (Russian verst), .00027778 yard.
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