gun barrel caliber = 0.000254 length
Try converting from "caliber" to actus (Roman actus), arpentcan, astronomical unit, Biblical cubit, cloth quarter, fathom, football field, gradus (Roman gradus), hand, light yr (light year), link (surveyors link), mil, mile, naval shot, pace, point (typography point), ri (Japanese ri), skein, stadium (Roman stadium), sun (Japanese sun), 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, .00000278 city block (informal), .00111111 cloth quarter, .00022222 ell, 1.45 en (typography en), 254,000,000,000 fermi, .00000278 football field, .00000126 furlong (surveyors furlong), .00034294 gradus (Roman gradus), .00329308 Greek palm, .00045872 Israeli cubit, .0001199 ken (Japanese ken), 254 micron, 4.57E-08 nautical league, .00005051 rod (surveyors rod), .00012077 sazhen (Russian sazhen), .00000231 skein, .00000138 stadium (Roman stadium), 1.58E-07 UK mile (British mile).
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