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The .300 H&H Magnum cartridge was introduced by the British company Holland & Holland as the Super-Thirty in June, 1925. [2] The case was belted like the .375 H&H Magnum, and is based on the same case, as also is the .244 H&H Magnum. The belt is for headspace as the cases' shoulders have a narrow slope rather than an actual shoulder.
The .300 Winchester Magnum was introduced in 1963 by Winchester for use in the Model 70 rifle. Winchester developed the .300 Win Mag by taking the .338 Winchester Magnum, which was introduced in 1958, moving the shoulder forward by 4.0 millimetres (0.156 in) and lengthening it by 3.0 millimetres (0.120 in). This resulted in a cartridge with a ...
4,112 ft⋅lbf (5,575 J) Test barrel length: 24 inches (610 mm) Source (s): Norma [1] The .375 H&H Magnum, also known as .375 Holland & Holland Magnum, is a medium-bore rifle cartridge introduced in 1912 by London based gunmaker Holland & Holland. [2] The .375 H&H cartridge featured a belt to ensure the correct headspace, which otherwise might ...
The .375 Weatherby Magnum was designed by Roy Weatherby in South Gate, California, in 1944 and put into production in 1945. The original cases were fire formed from .300 H&H Magnum Winchester brass, then from Richard Speer's 300 Weatherby brass [3] before finally settling with Norma as a source for cases.
The cartridge is standardized by the C.I.P. and is also known as .404 Rimless Nitro Express. [6] It was designed in 1905 by London based gunmaker W.J. Jeffery & Co to duplicate the performance of the .450/400 Nitro Express 3-inch in bolt-action rifles. [7] The .404 Jeffery fired a bullet of .422 in (10.72 mm) diameter of either 300 gr (19 g ...
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.
3,458 ft⋅lbf (4,688 J) Test barrel length: 24 in (610 mm) Source (s): Reloading data at Accurate Powder. .300 Remington Short Action Ultra Magnum (also known as 300 RSAUM, 300 RSUM or 300 Rem SAUM) is a .30 caliber short magnum cartridge that is a shortened version of the Remington 300 Ultra Mag, both of which derive from the .404 Jeffery case.
Headstamp. A headstamp is the markings on the bottom of a cartridge case designed for a firearm. It usually tells who manufactured the case. If it is a civilian case it often also tells the caliber: if it is military, the year of manufacture is often added. The left cartridge's headstamp says "FC 223 REM" which means that it was made by Federal ...