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Although the 6mm SAW's performance proved satisfactory, there were supply concerns over adopting a third rifle caliber. Development of the 6mm SAW was abandoned when an improved 5.56 mm round was promised, which arrived as the M855. 6×45mm SAW cartridges depending on their case materiel and bullet weigh 10.6 to 15 grams (164 to 231 gr).
The 6×45mm cartridge provides better down range performance than the .223 Remington or the 5.56 NATO cartridges. The cartridge is currently offered by Les Baer in an AR rifle. The cartridge had been offered by Cooper Arms, Kimber and a few other rifle manufacturers in their rifles as a regular factory chambering for a period of time. [3]
The XM235 was chambered for the experimental 6×45mm SAW cartridge. It had a 105-grain [6.8 gram] projectile and had a muzzle velocity of 2450 feet / second [747 meters / second]. The cartridge was intermediate in size between the 5.56×45mm NATO and 7.62×51mm NATO rounds and was considered essential for the SAW concept.
The 6.5×47mm Lapua was the most popular cartridge during the PRS competition in 2015 beating out competing cartridges by more than two thirds. [11] C.I.P. rules the 6.5×47mm Lapua and 6.5mm Creedmoor both at up to 435.00 MPa (63,091 psi) P max piezo pressure and the .260 Remington lower at up to 415.00 MPa (60,191 psi) P max piezo pressure.
Nearly 100 years after the .276 Pedersen introduced the concept of a 7mm infantry round for semi-automatic rifles, on April 19, 2022, the United States Army adopted the .277 Fury (6.8x51mm Common) as the United States Army's general-purpose cartridge, this cartridge features a 7.04 mm bullet in a two-part version of a necked down 7.62x51mm NATO ...
The M249 SAW is still in use as a squad automatic weapon by the US Army. In 2019, US Army launched Next Generation Squad Weapon Program to find replacement for M249 SAW and replacement for 5.56×45mm NATO round. There are three competitors: Sig Sauer MG-6.8 with 6.8 Sig hybrid round, declared winner of the program as the XM250
The 6XC is a 1000-yard cartridge, comparable to benchrest calibers such as 6x47mm Swiss Match, 6.5×47mm Lapua and 6 mm/22-250; it fits into cartridge class that exceeds the velocities of benchrest calibers such as 6mm BR Remington, 6mm BRX and 6mm Dasher. David Tubb has claimed several wins with the 6XC in NRA High Power National Championships ...
A month later, Frankford Arsenal decided on two cartridge designs for the new LMG: a 6 mm cartridge and a new 5.56 mm cartridge with a much larger case. [19] Neither design was finalized by March 1972, when the Army published the specifications document for the planned SAW. [20] The 6 mm cartridge design was eventually approved in May of that year.
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