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2. Gauge (firearms) - Wikipedia

   en.wikipedia.org/wiki/Gauge_(firearms)

   The gauge (in American English or more commonly referred to as bore in British English) of a firearm is a unit of measurement used to express the inner diameter (bore diameter) of the barrel. Gauge is determined from the weight of a solid sphere of lead that will fit the bore of the firearm and is expressed as the multiplicative inverse of the ...

3. Bore gauge - Wikipedia

   en.wikipedia.org/wiki/Bore_gauge

   Dial Bore Gauge. A dial bore gauge is a comparative instrument similar to a telescoping gauge, but includes a digital or analog readout. The dial bore gauge must be set to the nominal value of the bore, and it will measure the variation and direction of the bore from nominal. There are multiple ways to set this gauges to the nominal value.

4. Caliber - Wikipedia

   en.wikipedia.org/wiki/Caliber

   As a measurement of 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 × 50 = 200 in long (written as 4" L/50 or 4"/50).

5. Caliber (artillery) - Wikipedia

   en.wikipedia.org/wiki/Caliber_(artillery)

   The bore to barrel length ratio is called "caliber" in naval gunnery, [2]: 81 but is called "length" in army artillery. Before World War II, the US Navy used 5"/51 caliber (5" L/51) as surface-to-surface guns and 5"/25 caliber (5" L/25) as surface to air guns. By the end of World War II, the dual purpose 5-inch/38-caliber gun (5" L/38) was ...

6. 20-gauge shotgun - Wikipedia

   en.wikipedia.org/wiki/20-gauge_shotgun

   The 20- gauge shotgun, also known as 20 bore, is a type of smoothbore shotgun. 20-gauge shotguns have a bore diameter of .615 in (15.6 mm), while the 12-gauge has a bore diameter of .729 in (18.5 mm). [2] 12-gauge and 20-gauge shotguns are the most popular gauges in the United States. [3][4] The 20-gauge is popular among upland game hunters ...

7. 4 bore - Wikipedia

   en.wikipedia.org/wiki/4_bore

   The name, derived from an old English practice of bore measurements in gun-making which refers to a nominally 4-gauge bore, that is, a bore diameter that would accommodate a pure lead round ball weighing 1 ⁄ 4 of a pound. This would imply a bore diameter of 1.052-inch (26.7 mm), however in practice the bore diameter varied greatly as, in ...

8. Rifling - Wikipedia

   en.wikipedia.org/wiki/Rifling

   The twist travel and the bore diameter must be expressed in a consistent unit of measure, i.e. metric (mm) or imperial (in). The third method simply reports the angle of the grooves relative to the bore axis, measured in degrees.

9. .303 British - Wikipedia

   en.wikipedia.org/wiki/.303_British

   The measurement .303 inches (7.7 mm) is the nominal size of the bore measured between the lands which follows the older black powder nomenclature. Measured between the grooves, the nominal size of the bore is .311 inches (7.9 mm). Bores for many .303 military surplus rifles are often found ranging from around .309 to .318 inches (7.8–8.1 mm ...