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7mm Remington Magnum
250px
7mm Remington Magnum Cartridge
Type Rifle
Place of origin 22x20px United States
Production history
Designer Remington Arms Company
Designed 1962
Manufacturer Remington
Produced 1962–Present
Specifications
Parent case .375 Holland & Holland Magnum
Bullet diameter .284 in (Bad rounding hereScript error mm)
Neck diameter .315 in (Bad rounding hereScript error mm)
Shoulder diameter .491 in (Bad rounding hereScript error mm)
Base diameter .512 in (Bad rounding hereScript error mm)
Rim diameter .532 in (Bad rounding hereScript error mm)
Case length 2.5 in (Bad rounding hereScript error mm)
Overall length 3.29 in (Bad rounding hereScript error mm)
Rifling twist 1/9 to 1/10"
Primer type Large rifle magnum
Ballistic performance
Bullet weight/type Velocity Energy
110 gr (Bad rounding hereScript error g) Barnes TTS [1]3,500 ft/s (Bad rounding hereScript error m/s)2,992 ft·lbf (Bad rounding hereScript error J)
140 gr (Bad rounding hereScript error g) Nosler AB [2]3,110 ft/s (Bad rounding hereScript error m/s)3,006 ft·lbf (Bad rounding hereScript error J)
150 gr (Bad rounding hereScript error g) Soft Point [3]3,110 ft/s (Bad rounding hereScript error m/s)3,221 ft·lbf (Bad rounding hereScript error J)
165 gr (Bad rounding hereScript error g) Sierra GK BT [4]2,950 ft/s (Bad rounding hereScript error m/s)3,188 ft·lbf (Bad rounding hereScript error J)
175 gr (Bad rounding hereScript error g) Soft Point [5]2,860 ft/s (Bad rounding hereScript error m/s)3,178 ft·lbf (Bad rounding hereScript error J)
Test barrel length: 24"
Source(s): Accurate Powder [1]

The 7mm Remington Magnum rifle cartridge was introduced as a commercially available round in 1962,[1] 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.[2] The original purpose of the belted magnum concept taken from the .300 H&H and .375 H&H, was 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 follow up 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.[2]

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.[3] Maximum pressure is set by SAAMI at 61,000 PSI.[1] 52,000 CUP [4] Remington has recently offered Managed Recoil ammunition for achieving reduced recoil when shooting and for generating less meat damage when hunting smaller game.

DesignEdit

The 7mm Remington Magnum offers ballistics better than the .30-06 Springfield with bullet weights of 175 grains and less, the most popular load being a 160 grain spitzer loaded to 3,000 ft/s (Bad rounding hereScript error 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 7 mm 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 200 and even 220 grains.

UseEdit

Because of its flat shooting nature and the relatively tolerable recoil, the 7mm Remington Magnum is especially popular for Western plains use in the United States, as well as for use on plains game in Africa, where longer reach than commonly achieved with the .30-06 are most often needed Script error[citation needed]. It has also been chambered in sniper rifles as the US Secret Service counter-sniper team has deployed this cartridge in urban areas Script error[citation needed], and its use out to 2,000 yards has been commonly demonstrated in competition.Script error[citation needed]

Popular web gun author Chuck Hawks calls the 7mm Rem "one of the great all-around rifle cartridges."[5]

Choice of bullet and barrel lengthEdit

The choice of bullet made when reloading is critical, as the velocity of bullets at close ranges may result in a less tough bullet disintegrating without providing significant penetration on especially tough game.Script error[citation needed] Thus one would do well to use a premium bullet of some sort, for instance a bonded bullet.Script error[citation needed] The choice of barrel length is also critical, as a 26 or 27-inch (Bad rounding hereScript error mm) barrel is commonly needed to achieve the full velocity potential of the cartridge, and a 24 inches (Bad rounding hereScript error mm) barrel should be viewed as a practical minimum. This is because in shorter, i.e., sporter, barrels, of approximately 22 inches (Bad rounding hereScript error mm), the cartridge ballistics deteriorate to much the same as those achieved in a .270 Winchester, while generating more recoil and muzzle blast than the .270.Script error[citation needed]

See alsoEdit

ReferencesEdit

  1. 1.0 1.1 1.2 7 mm Remington Magnum data from Accurate Powder"
  2. 2.0 2.1 Speer Reloading Manual
  3. .264 Win Mag data from Accurate
  4. Speer Reloading Manual # 10 & Hornady Handbook of Cartridge Reloading 3rd Edition
  5. The 7mm Remington Magnum by Chuck Hawks

External linksEdit

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