gun barrel caliber = 0.000254 length (length)
Try converting from "caliber" to barleycorn, bolt (of cloth), cable length, chain (surveyors chain), city block (informal), earth to moon (mean distance earth to moon), fathom, football field, French, Greek span, hand, light yr (light year), m (meter), micron, nail (cloth nail), pace, pica (typography pica), ri (Japanese ri), shaku (Japanese shaku), soccer field, or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .00000716 actus (Roman actus), 2,540,000 angstrom, .00000434 arpentlin, .00055556 Biblical cubit, .00000694 bolt (of cloth), .4 bottom measure, .00083333 foot, .00000126 furlong (surveyors furlong), .00329308 Greek palm, .00045872 Israeli cubit, 5.26E-08 league, 2.68E-20 light yr (light year), 10 mil, 1.58E-07 mile, 6.47E-08 ri (Japanese ri), .00005051 rod (surveyors rod), 1.72E-07 Roman mile, .00083822 shaku (Japanese shaku), 1.93E-08 spindle, .00000137 stadia (Greek stadia).
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