7mm Remington Magnum

7mm Remington Magnum
Left to right: .308 Winchester, .284 Winchester and 7mm Remington Magnum
Type	Rifle
Place of origin	United States
Production history
Designer	Remington Arms Company
Designed	1962
Manufacturer	Remington
Produced	1962–Present
Specifications
Parent case	.375 H&H Magnum
Bullet diameter	.284 in (7.2 mm)
Neck diameter	.315 in (8.0 mm)
Shoulder diameter	.491 in (12.5 mm)
Base diameter	.512 in (13.0 mm)
Rim diameter	.532 in (13.5 mm)
Case length	2.5 in (64 mm)
Overall length	3.29 in (84 mm)
Case capacity	82.0 gr H2O (5.31 cm3)
Rifling twist	1/9 to 1/10"
Primer type	Large rifle magnum
Maximum pressure (C.I.P.)	62,366 psi (430.00 MPa)
Maximum pressure (SAAMI)	61,000 psi (420 MPa)
Maximum CUP	52,000 CUP
Ballistic performance
Bullet mass/type Velocity Energy 110 gr (7 g) Barnes TTS [1] 3,500 ft/s (1,100 m/s) 2,992 ft·lbf (4,057 J) 140 gr (9 g) Nosler AB [2] 3,110 ft/s (950 m/s) 3,006 ft·lbf (4,076 J) 150 gr (10 g) Soft Point [3] 3,110 ft/s (950 m/s) 3,221 ft·lbf (4,367 J) 165 gr (11 g) Sierra GK BT [4] 2,950 ft/s (900 m/s) 3,188 ft·lbf (4,322 J) 175 gr (11 g) Soft Point [5] 2,860 ft/s (870 m/s) 3,178 ft·lbf (4,309 J)
Test barrel length: 24" Source(s): Accurate Powder

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, which would be of concern when needing a fast follow up shot. The 7mm Remington Magnum is based on the commercial Winchester .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.

On its introduction, the 7mm Remington Magnum substantially usurped the market share held by the .264 Winchester Magnum, which went into sharp decline in popularity and sales after 1962. Remington has recently offered Managed Recoil ammunition for achieving reduced recoil when shooting and for generating less meat damage when hunting smaller game.

The 7mm Remington Magnum offers ballistics better than the .30-06 Springfield with bullet weights of 175 grains and less, one of the more popular loads being a 160 grain spitzer loaded to 3,000 ft/s (910 m/s). This is due both to the higher muzzle velocity of the magnum compared to the Springfield and that .284 diameter bullets tend to have better ballistic coefficients than .308 diameter bullets of comparable mass. It is arguable that the 7mm Remington Magnum offers marginally better ballistics with 175 grain bullets, the heaviest bullet commonly used in the caliber. The .30-06 Springfield can, however, be loaded with heavier bullets up to 220 grains.

The 7mm Remington Magnum has 5.31 ml (82 grain) H₂O cartridge case capacity.