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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.
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.
A guide to the recoil from the cartridge, and an indicator of bullet penetration potential. The .30-06 Springfield (at 2.064 lbf-s) is considered the upper limit for tolerable recoil for inexperienced rifle shooters. [2] Chg: Propellant charge, in grains; Dia: Bullet diameter, in inches; BC: Ballistic coefficient, G1 model; L: Case length (mm)
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
Comparison of 1880s rifles [1] Calibre System Country Velocity Height of trajectory Ammunition Muzzle 500 yd (460 m) 1,000 yd (910 m) 1,500 yd (1,400 m) 2,000 yd (1,800 m) 500 yd (460 m) 1,000 yd (910 m) 1,500 yd (1,400 m) 2,000 yd (1,800 m) Propellant Bullet .433 in (11.0 mm) Werndl–Holub rifle: Austria-Hungary
Most rifle cartridges have a high load density with the appropriate powders. Rifle cartridges tend to be bottlenecked, with a wide base narrowing down to a smaller diameter, to hold a light, high-velocity bullet. These cases are designed to hold a large charge of low-density powder, for an even broader pressure curve than a magnum pistol cartridge.
For example on an AR-type rifle, the mil-spec distance from center of bore to top of rail is 1.211 inches, or approximately 31 mm (1.2 in). The mount height itself, that is the distance from the top of rail to center of scope, varies, but typically lies around 36–38 mm (1.4–1.5 in) (higher and lower mounts are also readily available).