The 7mm Remington Magnum rifle cartridge was introduced as a commercial cartridge in 1962 along with the new Repington Model 700 repeating rifle. The caliber belongs to the belt-fed cartridge family, and is directly derived from the .375 H & H Magnum caliber. The original purpose of the belted Magnum concept from the .300 H & H Magnum and .375 H & H Magnum was to provide precise headspace control, as the sloped shoulders while facilitating cartridge extraction were unsuitable for this purpose. Improved cartridge extraction reliability is desirable when hunting dangerous game, which would be of concern when a rapid follow-up shot is required.
When introduced, the 7mm Remington Magnum significantly usurped the market share of the .264 Winchester Magnum, which experienced a sharp decline in popularity and sales after 1962. Remington offered Managed Recoil ammunition to provide less recoil when shooting and less meat damage when hunting small game.
The 7mm Remington Magnum offers superior ballistics compared to .30-06 Springfield with all available bullet weights. One of the most popular loads is the 160-grain pointed bullet, which has a muzzle velocity of 910 m/s. This is due to both the higher muzzle velocity of the Magnum caliber compared to the Springfield and the fact that 7.21 mm diameter bullets tend to have better ballistic coefficients than 7.62 mm diameter bullets of comparable mass. Because of the smaller bullet diameter, the 7.21 mm diameter also has a higher cross-sectional density than 7.62 mm diameter bullets and, because of this, greater penetration into the target. The heaviest commercially loaded ammunition available for the 7mm is 180 grain, while the .30-06 Springfield can be loaded with bullets weighing up to 220 grain.
Usage:
Because of its flat trajectory and relatively tolerable recoil, the 7mm Remington Magnum caliber is especially popular for big game hunting in Canada and the United States, as well as for hunting in Africa. It has also been used in sniper rifles.
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