gun barrel caliber = 0.000254 length
Try converting from "caliber" to actus (Roman actus), astronomical unit, barleycorn, Biblical cubit, cloth quarter, earth to moon (mean distance earth to moon), fermi, football field, Greek cubit, ken (Japanese ken), line, nautical mile, pace, palm, parsec, pica (typography pica), ri (Japanese ri), shaku (Japanese shaku), soccer field, yard, or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = 2,540,000 angstrom, .00035714 archin (Russian archin), .03 barleycorn, .4 bottom measure, .00000116 cable length, 6.61E-13 earth to moon (mean distance earth to moon), .00022222 ell, 1.45 en (typography en), 254,000,000,000 fermi, .00083333 foot, .762 French, .00013721 Greek fathom, .0025 hand, 2.68E-20 light yr (light year), 1.58E-07 mile, .00033333 pace, .00085822 Roman foot, 1.72E-07 Roman mile, .00000231 skein, 1.58E-07 UK mile (British mile).
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