gun barrel caliber = 0.000254 length
Try converting from "caliber" to agate (typography agate), archin (Russian archin), arpentlin, ell, engineers chain, furlong (surveyors furlong), Greek palm, hand, line, marathon, mil, pace, parasang, parsec, Roman mile, rope, shaku (Japanese shaku), skein, UK mile (British mile), yard, or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .14 agate (typography agate), 1.70E-15 astronomical unit, .00001263 chain (surveyors chain), .00222222 cloth finger, 1.45 en (typography en), .00000833 engineers chain, 254,000,000,000 fermi, .00083333 foot, .00000278 football field, .00000126 furlong (surveyors furlong), .00034294 gradus (Roman gradus), 5.26E-08 league, 3.94E-07 li (Chinese li), 6.02E-09 marathon, 10 mil, 1.58E-07 mile, .72270001 point (typography point), .00083822 shaku (Japanese shaku), 1.93E-08 spindle, .00083333 survey foot.
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