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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 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 case is fire formed in a 6mm PPC rifle, expanding the case powder capacity. The fire formed case is cleaned to remove lubricant and powder residue. The neck is then expanded to 6 mm and the case length is trimmed to 1.486 inches (37.7 mm), after which the neck is chamfered internally and externally.
In addition to case shape, rifle cartridges can also be grouped according to the case dimensions of a cartridge, this is usually referring to the cartridge's overall length (COL), which in turn dictates the minimal receiver size and operating space (bolt travel) needed by the action, into either "mini-action", "short-action", "long-action ...
The term belted magnum [1] [better source needed] or belted case refers to any cartridge, but generally a rifle cartridge, with a shell casing that has a pronounced "belt" around its base that continues 2–4 mm (0.079–0.157 in) past the extractor groove.
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
The 7mm Shooting Times Westerner, sometimes referred to as the 7mm STW, began as a wildcat rifle cartridge developed by Layne Simpson, Field Editor of Shooting Times, in 1979. [3] It is an 8mm Remington Magnum case that has been "necked down" (narrowing the case opening) by 1 mm to accept 7 mm (.284 in) bullets.
Overbore cartridges are those with a relatively large case volume or case capacity, coupled with a relatively small diameter bullet.. The case volume or case capacity and barrel bore area can be mathematically related to obtain a case volume to bore area ratio in metric or imperial units.