gun barrel caliber = 0.000254 meter (length)
Try converting from "caliber" to arpentcan, bolt (of cloth), chain (surveyors chain), engineers chain, foot, football field, furlong (surveyors furlong), gradus (Roman gradus), Greek cubit, Greek fathom, Greek palm, Greek span, line, m (meter), nautical mile, palm, parasang, spindle, sun (Japanese sun), verst (Russian verst), or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
caliber = .00055556 Biblical cubit, .4 bottom measure, .00000278 city block (informal), .01369863 digitus (Roman digitus), 254,000,000,000 fermi, .00000278 football field, .00034294 gradus (Roman gradus), .00054885 Greek cubit, .01 inch, 5.26E-08 league, 254 micron, 1.58E-07 mile, .00033333 pace, 8.23E-21 parsec, .00085822 Roman foot, 1.72E-07 Roman mile, .00012077 sazhen (Russian sazhen), .00000278 soccer field, .00111111 span (cloth span), .00027778 yard.
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