gun barrel caliber = 0.000254 length (length)
Try converting from "caliber" to barleycorn, Biblical cubit, bolt (of cloth), cable length, digitus (Roman digitus), ell, fathom, French, furlong (surveyors furlong), Greek palm, Greek span, hand, Israeli cubit, marathon, mil, pace, palm, Roman cubit, survey foot, UK mile (British mile), or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .00000434 arpentlin, .03 barleycorn, .00000278 city block (informal), 1.45 en (typography en), 254,000,000,000 fermi, .01142857 finger, .00083333 foot, .00000278 football field, .00109769 Greek span, .01 inch, .12 line, .00126263 link (surveyors link), 10 mil, 1.37E-07 nautical mile, .00000926 naval shot, 6.47E-08 ri (Japanese ri), .00057143 Roman cubit, 1.72E-07 Roman mile, .00000278 soccer field, .00838223 sun (Japanese sun).
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