From Wikipedia, the free encyclopedia:
"The 7 mm Remington Magnum rifle cartridge was introduced as a commercially available round in 1962, along with the new Remington Model 700 bolt action rifle. It is a member of the belted magnum family that is directly derived from the venerable .375 H&H Magnum. Roy Weatherby modified the H&H cases with a double-rounded "venturi" shoulder and straighter body. The original purpose of the belted magnum concept taken from the .300 H&H and .375 H&H to provide precise control of the head-space, since the sloping shoulders, while easing cartridge extraction, provided poor head-spacing. Improved cartridge extraction reliability is desirable while hunting dangerous game, which would be of concern when needing a fast followup shot. The 7mm Rem is based on the commercial Winchester .264 Win Mag, .338 Win Mag, and .458 Win Mag, which were based on the same belted .300 H&H and .375 H&H cases, trimmed to nearly the same length as the .270 Wby Mag.
The 7 mm Remington Magnum offers ballistics superior to the .30-06 Springfield with all equivalent bullet weights, the most popular load being a 160 grain spitzer loaded to 3,000 ft/s (910 m/s). This cartridge is capable of taking any game in North America, although one may do well to select a larger caliber for big bears. The 7 mm Remington Magnum also generates the heaviest recoil that many shooters can shoot well, having recoil comparable to the .30-06 Springfield, in contrast to the heavier recoil generated from more powerful magnum rounds such as the .338 Lapua Magnum. Because of this, the 7 mm Remington Magnum is especially popular for Western plains use in the United States, as well as for use on the African plains on non-dangerous game, where longer reach than commonly achieved with the .30-06 are most often needed. The US Secret Service counter-sniper team has also deployed this cartridge in urban areas, in specially modified rifles, and its use out to 1,000 yards has been commonly demonstrated in competition.
The choice of bullet made when reloading is critical, as the velocity of bullets at unintentionally close ranges may result in a less tough bullet disintegrating without providing significant penetration on especially tough game. The choice of barrel length is also critical, as a 26 or 27-inch (690 mm) barrel is commonly needed to achieve the full velocity potential of the cartridge. In shorter, i.e., sporter, barrels, of approximately 22 inches (560 mm), the cartridge ballistics deteriorate to much the same as achieved in a .270 Winchester, while having the apparent muzzle blast increased relative to that seen even with a 7 mm Remington Magnum fired from a longer barrel, and while generating much the same heavy recoil as experienced in shooting a 7mm Remington Magnum from a longer barrel. Used with a 26 or 27-inch (690 mm) barrel, though, the true benefit of the cartridge over the .30-06 and .270 Winchester becomes apparent.
On its introduction, the 7mm Rem. Mag. substantially usurped the market share held by the .264 Winchester Magnum, which went into sharp decline in popularity and sales after 1962. Maximum pressure is set by SAAMI at 61,000 PSI.
Remington has recently offered Managed Recoil ammunition for achieving reduced recoil when shooting and for generating less meat damage when hunting smaller game."
7 mm Remington Magnum. (2009, March 2). In Wikipedia, The Free Encyclopedia. Retrieved 15:19, March 20, 2009, from http://en.wikipedia.org/w/index.php?title=7_mm_Remington_Magnum&oldid=274473590