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The 6mm XC was initially developed as a Wildcat cartridge specifically for NRA High Power match shooting by 11-time US National Champion David Tubb. [2] [3] The round originated from chambering a barrel using a .243 Winchester reamer held short, with the case reformed from .22-250. [2]
The 7×61mm Sharpe & Hart Magnum belted cartridge (A.K.A. 7mm S&H Super [1]) was developed by Philip B. Sharpe and Richard (Dick) Hart in the 1950s. Some articles claim it was based on the .300 H&H Magnum case, [ 1 ] [ 2 ] while others claim it was based on the 7x61 MAS M1907 case.
The cartridge is a necked-up version of the .22 PPC which is in turn based on a .220 Russian (5.6×39mm). [5] The standard bullet diameter for 6 mm caliber cartridges is .243 inches (6.2 mm), the same diameter used in the .243 Winchester and 6mm Remington cartridges.
The .22 CHeetah (both C and H are upper-case, [1] referring to Carmichel / Huntington [2]) is a .22 wildcat cartridge developed in the 1970s or 1980s by Jim Carmichel and Fred Huntington. [ 3 ] The .22 CHeetah is essentially a Remington .308 BR (empty .308 Winchester cases [ 4 ] [ 5 ] ), modified to fit the .22 caliber . [ 6 ]
By comparison, the 5.56×45mm NATO cartridge, used in the M16 and M4 rifles, produces between 1,200–1,300 foot-pounds force (1,600–1,800 joules), while the .308 Winchester, a favorite for hunters, police, and military snipers, produces between 2,000–3,000 foot-pounds force (2,700–4,100 joules) depending on the load used.
The American Rifle A Treatise, a Text Book, and a Book of Practical Instruction in the Use of the Rifle By Townsend Whelen · 1918. Page 134; Gun Research Declassified Visit to Mauser-Werke 2022. Page 52; The Ultimate in Rifle Accuracy By Glenn Newick · 1990; Gunsmithing at Home: Lock, Stock & Barrel - Page 79, John E. Traister · 1996
Savion Hart of St. Thomas Academy and Maxwell Woods of Chanhassen are among the 10 finalists for Mr. Football as presented by Minnesota Football Coaches Association, and each of them made the Star ...
The cartridge was designed as an improvement to the .50 BMG cartridge, a common machine gun and rifle cartridge. It is a wildcatted .50 BMG case, shortened to 3.27 inches (83 mm) from its original length of 3.91 inches (99 mm) and necked down to accept a .416 caliber , 398-grain (25.8 g) projectile; [ 3 ] [ 4 ] however, the case dimensions are ...