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Based upon the well-proven .375 H&H Magnum rimless belted big-game cartridge case heavily necked down, the .244 H&H originally fired a 100-grain (6.5 g), aluminum-jacketed, copper-pointed bullet pushed by 74 grains (4.8 g) of non-cordite smokeless (nitrocellulose) powder, and returned a muzzle velocity of about 3,500 feet per second (1,100 m/s).
Due to the heavy bullet and powder charge, the gun has significant recoil but this is mitigated by the low velocity, resulting in recoil being delivered as a strong push rather than a violent blow. Rifles chambered for this cartridge tend to be heavy double-gun style, and are typically quite expensive. [3] Dimensions of the .470 Nitro Express.
The 6mm Remington has the advantage of a relatively low recoil of about 10 ft/lbs depending on load. Some gun writers, including Chuck Hawks of Guns and Shooting Online believe that this has the advantage of allowing shooters to be comfortable with the rifle without developing a flinch, allowing them to focus on accurate shot placement. [3] [4]
The .400 H&H Magnum is a modern rifle cartridge designed for hunting large and dangerous game animals. The cartridge would be legal in countries which require a .400 minimum caliber for the hunting of dangerous game. [ 2 ]
Rifles chambered for the .465 H&H Magnum have a bore ∅ of 11.65 mm (0.459 in) and a groove ∅ of 11.87 mm (0.467 in). Twist rate for rifles can range from one revolution in 406 mm (16.0 in) to 711 mm (28.0 in). The maximum average pressure suggested for the cartridge is 4,300 bar (62,000 psi).
The .450 Rigby is a rifle cartridge designed in 1994 by John Rigby & Co. for the purpose of hunting large, thick-skinned dangerous African game animals. The cartridge is essentially a .416 Rigby necked up to accept a .458 in (11.6 mm) bullet, although with a higher operating pressure and much of the original taper removed.
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The .240 Weatherby Magnum was developed in 1968 by Roy Weatherby.In the development of his own .240in/6 mm cartridge, Weatherby was significantly influenced by both the success and the limitations of the .244 H&H Magnum cartridge devised in England by his friend and colleague David Lloyd.