7mm Remington Magnum

7mm Remington Magnum
Left to right: .308 Winchester, .284 Winchester and 7mm Remington Magnum
TypeRifle
Place of originUnited States
Production history
DesignerRemington Arms Company
Designed1962
ManufacturerRemington
Produced1962–present
Specifications
Parent case.375 H&H Magnum
Case typeRimless, bottleneck
Bullet diameter.284 in (7.2 mm)
Land diameter.277 in (7.0 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 length2.5 in (64 mm)
Overall length3.29 in (84 mm)
Case capacity82.0 gr H2O (5.31 cm3)
Rifling twist1/9 in (230 mm) to 1/10 in (250 mm)
Primer typeLarge rifle magnum
Maximum pressure (C.I.P.)62,366 psi (430.00 MPa)
Maximum pressure (SAAMI)61,000 psi (420 MPa)
Maximum CUP52,000 CUP
Ballistic performance
Bullet mass/type Velocity Energy
110 gr (7 g) Barnes TTS[citation needed] 3,500 ft/s (1,100 m/s) 2,992 ft⋅lbf (4,057 J)
140 gr (9 g) Nosler AB[citation needed] 3,110 ft/s (950 m/s) 3,006 ft⋅lbf (4,076 J)
150 gr (10 g) Soft Point[citation needed] 3,110 ft/s (950 m/s) 3,221 ft⋅lbf (4,367 J)
165 gr (11 g) Sierra GK BT[citation needed] 2,950 ft/s (900 m/s) 3,188 ft⋅lbf (4,322 J)
175 gr (11 g) Soft Point[citation needed] 2,860 ft/s (870 m/s) 3,178 ft⋅lbf (4,309 J)
Test barrel length: 24 in (610 mm)
Source(s): Accurate Powder [1]

The 7mm Remington Magnum rifle cartridge was introduced as a commercially available round in 1962,[2] 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.[3] 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.[3]

  1. ^ 7 mm Remington Magnum data from Accurate Powder"
  2. ^ Accurate (2000). Accurate Smokeless Powders Loading Guide (Number Two (Revised) ed.). Prescott, AZ: Wolfe Publishing. p. 247. Barcode 94794 00200.
  3. ^ a b Speer Reloading Manual