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  2. 6 mm caliber - Wikipedia

    en.wikipedia.org/wiki/6_mm_caliber

    Firearm cartridges. 7 mm ». This is a list of firearm cartridges which have bullets of a caliber between 6 millimetres (0.236 in) and 6.99 millimetres (0.275 in). Length refers to the cartridge case length. OAL refers to the overall length of the cartridge. Measurements are in millimeters then inches, i.e. mm (in).

  3. 6.8mm Remington SPC - Wikipedia

    en.wikipedia.org/wiki/6.8mm_Remington_SPC

    The 6.8mm Remington Special Purpose Cartridge (6.8 SPC, 6.8 SPC II or 6.8×43mm) is a rimless bottlenecked intermediate rifle cartridge that was developed by Remington Arms in collaboration with members of the U.S. Army Marksmanship Unit and United States Special Operations Command [6] to possibly replace the 5.56 NATO cartridge in short barreled rifles (SBR) and carbines.

  4. .25 ACP - Wikipedia

    en.wikipedia.org/wiki/.25_ACP

    850 ft/s (260 m/s) 96 ft⋅lbf (130 J) Test barrel length: 2". Source (s): Buffalo Bore [2] Ballistics 101 [3] The .25 ACP (Automatic Colt Pistol), also known as the .25 Auto, .25 Automatic, or 6.35×16mmSR) is a semi-rimmed, straight-walled centerfire pistol cartridge introduced by John Browning in 1905 alongside the Fabrique Nationale M1905 ...

  5. HK 4.6×30mm - Wikipedia

    en.wikipedia.org/wiki/HK_4.6×30mm

    The 4.6×30mm (designated as the 4,6 × 30 by the C.I.P. [6]) cartridge is a small- caliber, high- velocity, smokeless powder, rebated, bottleneck, centerfire cartridge designed for personal defense weapons (PDW) developed by German armament manufacturer Heckler & Koch (HK) in 1999. It was designed primarily for the MP7 PDW to minimize weight ...

  6. 9×19mm Parabellum - Wikipedia

    en.wikipedia.org/wiki/9×19mm_Parabellum

    The 9×19mm Parabellum (also known as 9mm Luger, 9mm NATO or simply 9mm) is a rimless, centerfire, tapered firearms cartridge. Originally designed by Austrian firearm designer Georg Luger in 1901, [6] it is widely considered the most popular handgun and submachine gun cartridge due to its low cost, adequate stopping power and extensive ...

  7. 5.6×57mm - Wikipedia

    en.wikipedia.org/wiki/5.6×57mm

    The .223 Winchester Super Short Magnum is a 21st-century cartridge that is comparable to the 5.6×57 mm. [2] The 5.6×57mm cartridge case has a distinctively thick case wall, and this causes significant problems when handloading, owing to the force that needs to be used through the press when re-sizing the case neck. It has been suggested that ...

  8. 35 mm equivalent focal length - Wikipedia

    en.wikipedia.org/wiki/35_mm_equivalent_focal_length

    35 mm equivalent focal length. The resulting images from 50 mm and 70 mm lenses for different sensor sizes; 36x24 mm (red) and 24x18 mm (blue) In photography, the 35 mm equivalent focal length is a measure of the angle of view for a particular combination of a camera lens and film or image sensor size. The term is popular because in the early ...

  9. History of the metric system - Wikipedia

    en.wikipedia.org/wiki/History_of_the_metric_system

    Units in everyday use by country as of 2019 The history of the metric system began during the Age of Enlightenment with measures of length and weight derived from nature, along with their decimal multiples and fractions. The system became the standard of France and Europe within half a century. Other measures with unity ratios [Note 1] were added, and the system went on to be adopted across ...