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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.
The .277 Wolverine (6.8x39mm) is a wildcat cartridge. It is a multi-purpose mid-power cartridge with increased ballistic performance over the AR-15 's traditional .223 Remington (5.56×45mm NATO) cartridge. The use of a modified 5.56 case means that at minimum, only a new barrel is needed to convert any 5.56-based firearm to .277 Wolverine.
The .277 Fury or 6.8×51mm Common Cartridge, [4][5] (designated as the .277 SIG Fury by SAAMI [1]) is a centerfire rimless bottlenecked rifle cartridge announced by SIG Sauer in late 2019. [2] Its hybrid three-piece cartridge case has a steel case head and brass body connected by an aluminum locking washer to support the high chamber pressure ...
The 6.5mm Creedmoor (6.5×48mm), [6] designated 6.5 Creedmoor by SAAMI, 6,5 Creedmoor by the C.I.P. [4] is a centerfire rifle cartridge introduced by Hornady in 2007. [7]It was developed by Hornady senior ballistics scientist Dave Emary in partnership with Dennis DeMille, the vice-president of product development at Creedmoor Sports, hence the name.
However, this cartridge was designed to shoot 110- to 160-grain bullets to be stabilized by 1:10 twist barrels, similar to the .270 Win. In 2007, Hornady launched its new 6.5 Creedmoor, also designed to be fed from a short action mechanism. Thought of as a bench-rest competition cartridge rather than a hunting cartridge, it is designed to shoot ...
The designation of M468 stands for an M4 carbine chambered for the 6.8mm SPC cartridge. It was an attempt to create an optimal Special Operations close-to-medium range carbine for Close Quarter Battle (CQB). A 12-inch barreled micro-carbine and 16-inch barreled carbine version were created. Barrett ceased manufacturing the rifle in 2010.
Joyce W. Hornady began manufacturing bullets in the spring of 1949 with a .30 caliber 150 gr (9.7 g) spire point selling for $4.50 per hundred. Within a year Hornady was producing thirteen different bullets in five different calibers. The Korean War caused material shortages limiting early production. An early innovation was thinner copper ...
"During SPC development different bullet diameters of 6 mm, 6.5 mm, 6.8mm, 7 mm, and 7.62 mm were tested, using multiple bullet types, shapes, and weights from 90 to 140 gr--the 6.8 mm was selected because it offered the BEST combination of combat accuracy, reliability, and terminal performance for 0-500 yard engagements in an M4 size package."