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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.
6×57mm 2600 0.236 57mm aka 6.2×57mm RWS. Necked down 6.5×57mm. The 6mm Remington is a carbon copy. 6×62mm Freres 1983 Germany 1 R 6×62mm 3460 2260 0.243 62mm also 6×62mmR, based on 9.3×62mm case. 6mm Lee Navy: 1895 US 0 R 6×60mmSR 2560 1629 0.236 60mm Service cartridge of the United States Navy and Marine Corps from 1895 6 mm PPC: 1975 US R
The rimless cartridge has a base diameter of 11.82 mm (similar to the 7.62×51mm NATO) and a case length of 47.72 mm. [2] The bullet is an unusual 6.65 mm diameter (6.45mm refers to the bore diameter), fractionally smaller than the common 6.5 mm (bore diameter) bullet. The 97 gr (6.3 g) bullet was fired at a muzzle velocity of 900 m/s (3,000 ft ...
The military designation for this round is 6.8 common cartridge. [5] The XM1186 is the general-purpose 6.8 mm round, with other versions including reduced range rounds so weapons chambered in 6.8 mm can fire on existing ranges designed for the 5.56 mm, marking rounds for force-on-force shooting, and blank and tracer rounds. [26]
In 1925, Winchester introduced the .270 Winchester, previously known as the .270 WCF, based on the 30-06 Springfield case necked down to .277" (6.8 mm). Although the .270 Winchester was not an instant success, within a few decades it became one of the most popular big game hunting cartridges for mid sized game worldwide, because of its relatively mild recoil and flat trajectory within ...
A popular 7 mm hunting caliber bullet is actually .283 in diameter (7.2 mm), but wildcat cartridges using this caliber bullet in a 5.56 x 45 case have so far not been successful. There is an existing and well-developed use of hunting-rifle bullets in the .277 caliber (6.8 mm), introduced by Winchester as the 270 in 1925.
The 6mm Creedmoor is a necked-down version of the 6.5mm Creedmoor using 6 mm (.243 inch) bullets, lighter than 6.5 mm bullets with similarly reduced recoil. [30] John Snow at Outdoor Life built a 6mm Creedmoor rifle in 2009 for a magazine article of the wildcat cartridge that appeared in 2010, but the first documented conception of the 6mm ...
Compared to the M4A1 carbine weighing 6.34 lb (2.88 kg) unsuppressed, with a basic combat load of 210 rounds in seven 30-round magazines, in total weighing 7.4 lb (3.4 kg), the XM7 rifle weighs about 2 lb (0.91 kg) more and each soldier carries roughly a 4 lb (1.8 kg) heavier load with 70 fewer rounds.