gun barrel caliber = 0.000254 length (length)
Try converting from "caliber" to barleycorn, city block (informal), digitus (Roman digitus), earth to moon (mean distance earth to moon), fermi, Greek fathom, Israeli cubit, light yr (light year), micron, mile, nautical league, naval shot, parasang, point (typography point), Roman foot, sazhen (Russian sazhen), skein, sun (Japanese sun), verst (Russian verst), yard, or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .00001263 chain (surveyors chain), .00111111 cloth quarter, .00013889 fathom, 254,000,000,000 fermi, .00083333 foot, .00000278 football field, .762 French, .00054885 Greek cubit, .00109769 Greek span, .00045872 Israeli cubit, .0001199 ken (Japanese ken), 6.02E-09 marathon, 254 micron, .00444444 nail (cloth nail), .00333333 palm, 4.51E-08 parasang, .06 pica (typography pica), .00004167 rope, .00083333 survey foot, .00030312 vara (Mexican vara).
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