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  2. Gauge (firearms) - Wikipedia

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

    Gauge was 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 sphere's weight as a fraction of a pound, e.g., a one-twelfth pound lead ball fits a 12-gauge bore. Therefore with a 12-gauge, it would take 12 balls of lead of the same size as the 12 gauge ...

  3. Shotgun cartridge - Wikipedia

    en.wikipedia.org/wiki/Shotgun_cartridge

    This measurement comes from the time when early cannons were designated in a similar manner—a "12 pounder" would be a cannon that fired a 12-pound (5.4 kg) cannonball; inversely, an individual "12-gauge" shot would in fact be a 1 ⁄ 12 pounder. Thus, a 10-gauge shotgun has a larger-diameter barrel than a 12-gauge shotgun, which has a larger ...

  4. List of body armor performance standards - Wikipedia

    en.wikipedia.org/wiki/List_of_body_armor...

    12 gauge: This armor would protect against five hits, fired from 5 meters, of: 35 g (540 gr) 12 gauge lead-core "Hunter" shotshells at a velocity of 390–410 m/s (1279–1345 ft/s) Class 3 5.45×39mm 7.62×39mm: This armor would protect against three hits, fired from 5.10 meters, of:

  5. List of track gauges - Wikipedia

    en.wikipedia.org/wiki/List_of_track_gauges

    Standard gauge is defined both in metric and in imperial units. It is also the best-known gauge worldwide; 55% of the world uses this track. In 2020, China’s rail network is standard gauge, with around 79,685 km (49,514 mi) of line. [92] 1,440 mm 4 ft 8 + 11 ⁄ 16 in: Switzerland

  6. Caliber - Wikipedia

    en.wikipedia.org/wiki/Caliber

    In the case of a 12-gauge (18.5 mm) shotgun, it would take 12 spheres the size of the shotgun's bore to equal a pound. [12] A numerically larger gauge indicates a smaller barrel: a 20-gauge (15.6 mm) shotgun requires more spheres to equal a pound; therefore, its barrel is smaller than the 12-gauge. This metric is used in Russia as "caliber ...

  7. Military 12-gauge cartridges - Wikipedia

    en.wikipedia.org/wiki/Military_12-gauge_cartridges

    Military use of combat shotguns through the 20th century has created a need for ammunition maximizing the combat effectiveness of such weapons within the limitations of international law. 12-gauge has been widely accepted as an appropriate bore diameter to provide an effective number of projectiles within an acceptable recoil.

  8. Cartridge (firearms) - Wikipedia

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

    A 12-gauge Brenneke slug Two views of intact bean bag round and one view of the projectile A cutaway showing a Japanese Navy 7.7 mm rimmed rounds as fired by the Type 92 and Type 97 machine guns—copies of Vickers and Lewis designs.

  9. Birmingham gauge - Wikipedia

    en.wikipedia.org/wiki/Birmingham_gauge

    The gauge starts at the lowest gauge number of 5Ø or 00000, corresponding to the largest size of 0.500 inches (12.7 mm), and runs to the highest gauge number of 36, corresponding to the smallest size of 0.004 inches (0.10 mm).

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