gun barrel caliber = 0.000254 length (length)
Try converting from "caliber" to archin (Russian archin), Biblical cubit, digitus (Roman digitus), en (typography en), engineers chain, football field, furlong (surveyors furlong), gradus (Roman gradus), Greek palm, Israeli cubit, light yr (light year), micron, parasang, parsec, pica (typography pica), point (typography point), Roman foot, rope, span (cloth span), stadium (Roman stadium), or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .14 agate (typography agate), .01369863 digitus (Roman digitus), 6.61E-13 earth to moon (mean distance earth to moon), .00000833 engineers chain, 254,000,000,000 fermi, .01142857 finger, .00000278 football field, .00329308 Greek palm, .00109769 Greek span, .00045872 Israeli cubit, 5.26E-08 league, 3.94E-07 li (Chinese li), 6.02E-09 marathon, 1.58E-07 mile, .00444444 nail (cloth nail), .06 pica (typography pica), .00000278 soccer field, .00111111 span (cloth span), 1.93E-08 spindle, 1.58E-07 UK mile (British mile).
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