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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 7.62 mm cartridge was too heavy and the 5.56 mm cartridge could not provide effective performance at that range. Research led to the development of the 6×45mm SAW cartridge. Its 105 gr (6.8 g) bullet had a muzzle velocity of 2,520 feet per second (770 m/s) and muzzle energy of 1,488 ft⋅lb (2,017 J).
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 6x45mm is a now considered obsolete, rimless, bottlenecked cartridge base on the .223 Remington or 5.56 NATO cartridge necked up to .243 (6mm). The cartridge is also known as the 6mm-233 Remington or 6mm/223.
The .25-45 Sharps (6.35×45mm) is a firearms cartridge designed by Michael H Blank, [2] then CEO of the Sharps Rifle Company, LLC, as a general hunting cartridge for most North American game, in particular deer, antelope, hogs, and coyotes. [3]
The Thompson/Center Ugalde, or TCU family of wildcat cartridges, was developed by Wes Ugalde of Fallon, Nevada, by necking up .223 Remington brass to accept larger bullets. The cartridges were developed for the Thompson Center Arms Contender single shot pistol, and are widely used in handgun metallic silhouette competition and handgun hunting.
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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.