gun barrel caliber = 0.000254 meter (length)
Try converting from "caliber" to agate (typography agate), arpentlin, astronomical unit, cable length, city block (informal), earth to moon (mean distance earth to moon), ell, en (typography en), furlong (surveyors furlong), hand, li (Chinese li), micron, mile, nail (cloth nail), pace, palm, Roman cubit, shaku (Japanese shaku), spindle, 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, .03 barleycorn, .4 bottom measure, .00222222 cloth finger, .01369863 digitus (Roman digitus), 6.61E-13 earth to moon (mean distance earth to moon), 1.45 en (typography en), .00000833 engineers chain, .00013889 fathom, .00083333 foot, 2.68E-20 light yr (light year), .12 line, .000254 m (meter), 4.57E-08 nautical league, 1.37E-07 nautical mile, .00033333 pace, .72270001 point (typography point), .00005051 rod (surveyors rod), .00000138 stadium (Roman stadium), .00027778 yard.
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