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Caliber
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==As a measurement of length== {{Main|Caliber (artillery)#Barrel length}} The term caliber is used as a measure of length of [[artillery]] barrels from muzzle to breech, expressed as a multiple of the bore diameter. For example, a 4-inch gun of 50 calibers would have a barrel 4 in Γ 50 = 200 in long (written as 4" L/50 or 4"/50). A 16-inch gun of 50 calibers (16" L/50) has a barrel length of 50 Γ 16 = {{convert|800|in|ftin}}. Both 14-in and 16-in navy guns were common in World War II. The British Royal Navy insisted on 50-cal guns on ships as it would allow {{convert|1,900|to|2,700|lb|kg|abbr=on}} shells to travel at an initial velocity of up to 1,800 mph (2,897 km/h) to a distance of 26 mi (42 km).{{citation needed|date=December 2014}}
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