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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. Caliber - Wikipedia

    en.wikipedia.org/wiki/Caliber

    While modern firearms are generally referred to by the name of the cartridge the gun is chambered for, they are still categorized together based on bore diameter. [citation needed] For example, a firearm might be described as a "30 caliber rifle", which could accommodate any of a wide range of cartridges using a roughly 0.30 inches (7.6 mm) projectile; or as a "22 rimfire", referring to any ...

  4. Bore (engine) - Wikipedia

    en.wikipedia.org/wiki/Bore_(engine)

    Bore (engine) In a piston engine, the bore (or cylinder bore) is the diameter of each cylinder. Engine displacement is calculated based on bore, stroke length and the number of cylinders: [1] The stroke ratio, determined by dividing the bore by the stroke, traditionally indicated whether an engine was designed for power at high engine speeds ...

  5. 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.

  6. Shotgun cartridge - Wikipedia

    en.wikipedia.org/wiki/Shotgun_cartridge

    The .410 bore is the smallest shotgun size which is widely available commercially in the United States. For size comparison purposes, the .410, when measured by gauge, would be around 67- or 68-gauge (it is 67.62-gauge), The .410 is often mistakenly assigned 36-gauge. The 36 gauge had a 0.506" bore. Reloading components are still available.

  7. Boring (manufacturing) - Wikipedia

    en.wikipedia.org/wiki/Boring_(manufacturing)

    Boring (manufacturing) A part's-eye view of a boring bar. Hole types: Blind hole (left), through hole (middle), interrupted hole (right). In machining, boring is the process of enlarging a hole that has already been drilled (or cast) by means of a single-point cutting tool (or of a boring head containing several such tools), such as in boring a ...

  8. .410 bore - Wikipedia

    en.wikipedia.org/wiki/.410_bore

    The Savage Model 24 is an American-made, over-and-under, combination gun, manufactured by Savage Arms. The basic .22LR over .410 bore model weighs 7 pounds (3.2 kg), has 24-inch (610 mm) barrels, and an overall length of 41 inches (1,000 mm). It may also be disassembled for ease of stowage.

  9. Internal ballistics - Wikipedia

    en.wikipedia.org/wiki/Internal_ballistics

    The limit to bore diameter is generally the sectional density of the projectile (see external ballistics). Larger-diameter bullets of the same weight have much more drag, and so they lose energy more quickly after exiting the barrel. In general, most handguns use bullets between .355 (9 mm) and .45 (11.5 mm) caliber, while most rifles generally ...