gun barrel caliber = 0.000254 length (length)
Try converting from "caliber" to barleycorn, bottom measure, chain (surveyors chain), city block (informal), cloth quarter, digitus (Roman digitus), ell, finger, foot, football field, Greek cubit, Greek fathom, Greek palm, inch, micron, nautical league, parsec, rod (surveyors rod), rope, vara (Mexican vara), or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = 2,540,000 angstrom, 1.70E-15 astronomical unit, .00055556 Biblical cubit, .00000278 city block (informal), .00022222 ell, .00000833 engineers chain, .00000278 football field, .00054885 Greek cubit, .00109769 Greek span, .0001199 ken (Japanese ken), 2.68E-20 light yr (light year), .12 line, 254 micron, .00444444 nail (cloth nail), .00333333 palm, .00057143 Roman cubit, .00085822 Roman foot, .00012077 sazhen (Russian sazhen), .00000278 soccer field, .00111111 span (cloth span).
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