The 7mm 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. The original purpose of the belted magnum concept taken from the.300 H&H Magnum and.375 H&H Magnum, was to provide precise headspace control, since the sloping shoulders, while easing cartridge extraction, were unsuitable for this purpose. Improved cartridge extraction reliability is desirable while hunting dangerous game, in particular when a fast follow-up shot is required. The 7mm Remington Magnum is based on the commercial.264 Winchester Magnum, .338 Winchester Magnum, and.458 Winchester Magnum, which were based on the same belted.300 H&H Magnum and.375 H&H Magnum cases, trimmed to nearly the same length as the.270 Weatherby Magnum.
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