gun barrel caliber = 0.000254 length (length)
Try converting from "caliber" to agate (typography agate), astronomical unit, cable length, chain (surveyors chain), earth to moon (mean distance earth to moon), en (typography en), engineers chain, fathom, fermi, finger, foot, Greek span, hand, league, line, nautical mile, Roman cubit, skein, stadium (Roman stadium), survey foot, or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = 2,540,000 angstrom, .00000434 arpentlin, 1.70E-15 astronomical unit, .01369863 digitus (Roman digitus), 6.61E-13 earth to moon (mean distance earth to moon), .00045872 Israeli cubit, 3.94E-07 li (Chinese li), .12 line, .000254 m (meter), .00444444 nail (cloth nail), 4.57E-08 nautical league, 4.51E-08 parasang, 8.23E-21 parsec, .72270001 point (typography point), .00012077 sazhen (Russian sazhen), .00111111 span (cloth span), .00838223 sun (Japanese sun), 1.58E-07 UK mile (British mile), .00030312 vara (Mexican vara), 2.38E-07 verst (Russian verst).
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