8mm Remington Magnum
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8mm Remington Magnum | ||||||||||||||||||||||||
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Remington Arms Company | ||||||||||||||||||||||||
Designed | 1978 | |||||||||||||||||||||||
Manufacturer | Remington | |||||||||||||||||||||||
Produced | 1978–present | |||||||||||||||||||||||
Specifications | ||||||||||||||||||||||||
Parent case | .375 H&H Magnum | |||||||||||||||||||||||
Case type | Belted, bottleneck | |||||||||||||||||||||||
Bullet diameter | .323 in (8.2 mm) | |||||||||||||||||||||||
Neck diameter | .355 in (9.0 mm) | |||||||||||||||||||||||
Shoulder diameter | .487 in (12.4 mm) | |||||||||||||||||||||||
Base diameter | .513 in (13.0 mm) | |||||||||||||||||||||||
Rim diameter | .532 in (13.5 mm) | |||||||||||||||||||||||
Rim thickness | .050 in (1.3 mm) | |||||||||||||||||||||||
Case length | 2.850 in (72.4 mm) | |||||||||||||||||||||||
Overall length | 3.600 in (91.4 mm) | |||||||||||||||||||||||
Case capacity | 99.0 gr H2O (6.42 cm3) | |||||||||||||||||||||||
Rifling twist | 1 in 10 (1 in 254 mm) | |||||||||||||||||||||||
Primer type | Large Rifle | |||||||||||||||||||||||
Maximum pressure (C.I.P.) | 63,817 psi (440.00 MPa) | |||||||||||||||||||||||
Maximum pressure (SAAMI) | 65,000.0 psi (448.159 MPa) | |||||||||||||||||||||||
Ballistic performance | ||||||||||||||||||||||||
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Test barrel length: 22 in (56 cm) 24 in (61 cm) and 26 in (66 cm) Source(s): Remington [1] / Nosler [2]/Sierra |
The 8mm Remington Magnum
Background
The 8mm Remington Magnum was intended to compete with the .300 Weatherby Magnum and .338 Winchester Magnum. Remington's decision to use a metric bullet may have been prompted by their past success with the 7 mm bore diameter.[3]
Even though the 8mm Remington Magnum has never been very popular, it is a very suitable cartridge for the hunting of elk, moose, caribou, and larger African antelope. However, the .338 Winchester Magnum had a 30-year head start on the market, and is short enough for medium length actions, which increases the models of rifles it could be produced in. It is also available with heavier bullets, although this isn't a problem for people that load their own rounds of this caliber. Bullet selection is quite critical with the 8mm Remington Magnum since the bullets have to be designed and constructed to hold together at magnum velocities.[4]
Cartridge dimensions
The 8mm Remington Magnum has 6.43
8mm Remington Magnum maximum C.I.P. cartridge dimensions. All sizes in millimetres (mm).
Americans would define the shoulder angle at alpha/2 = 25 degrees. The common
According to the official
This means that 8mm Remington Magnum chambered arms in C.I.P. regulated countries are currently (2014) proof tested at 550.00 MPa (79,771 psi) PE piezo pressure.[5]
The
The German 8×68mm S cartridge introduced in 1939 is probably the closest ballistic twin of the 8mm Remington Magnum. The 8×68mm S is however a rebated rim cartridge.
The 8mm Remington Magnum in field use
The 8mm Remington Magnum as a pure civil cartridge can be used in countries which ban civil use of former or current military ammunition.
A powerful cartridge like the 8mm Remington Magnum has its drawbacks. Like every other big game cartridge it presents a stout recoil. Since there are not many factory loads available, the 8mm Remington Magnum is often used by reloaders. They can use this cartridge to create powerful loads by handloading, while staying within the 448 MPa (65000 psi) SAAMI piezo pressure limit. Combined with bullets with jackets designed for magnum cartridge muzzle velocities, and barrels of 650 mm (25.6 in) or longer to promote high muzzle velocities, the 8mm Remington Magnum offers the flattest trajectory and best long range performance of the commercially available 8 mm rifle cartridges.
From 8 mm caliber upwards the rise of sectional density and penetrating capability of practical spin stabilized rifle bullets (bullets up to 5 to 5.5 calibers in length) tends to flatten out.[7]
This means that loaded with light, short and soft-nosed 8 mm bullets the 8mm Remington Magnum can be used on remarkably small game. Loaded with heavy, long and hard (solid copper) bullets the 8mm Remington Magnum offers enough velocity derived power to penetrate heavy and dangerous game. With developed handloads, the 8mm Remington Magnum is capable of driving a 220 grain boat tail bullet in excess of 3,000 ft/sec, and delivers as much energy at 500 yards (457m) as the
8mm cartridges compared
Maximum muzzle velocity comparison in % of the probably most proliferated European and American 8 mm rifle cartridges out of 650 mm (25.59 in) long barrels loaded with relatively light to heavy 8 mm bullets to their
Bullet weight gram (grain) | 8.23 g (127 gr) | 9.72 g (150 gr) | 11.34 g (175 gr) | 12.96 g (200 gr) | 14.26 g (220 gr) | Case capacity (%) |
7.92×57mm Mauser (8×57mm IS) | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
8×64mm S | 102.7 | 102.7 | 102.8 | 102.9 | 102.9 | 110.3 |
.325 WSM | 108.7 | 109.1 | 109.0 | 109.3 | 111.1 | 131.7 |
8×68mm S | 108.4 | 108.5 | 108.7 | 110.5 | 112.3 | 136.5 |
8mm Rem. Mag. | 111.9 | 112.3 | 114.5 | 115.3 | 116.0 | 157.1 |
This comparison is not totally objective since the 8mm Remington Magnum and
The 8mm Remington Magnum as parent case
7mm STW (Shooting Times Westerner)
The 8mm Remington Magnum case has functioned as the parent case for the
.416 Remington Magnum
The 8mm Remington Magnum case also has functioned as the parent case for the .416 Remington Magnum, which is a .416" caliber necked up version of the 8mm Remington Magnum. Unlike the 7 mm STW, the .416 Remington Magnum never had a wildcat status. It was designed by Remington and released directly to the public in 1988.
Wildcats
Cartridges that are not officially registered with nor sanctioned by
Wildcats are not governed by C.I.P. or SAAMI rules so wildcatters can capitalize the achievable high operating pressures. Because the 8mm Remington Magnum offers an exceptional sturdy, pressure resistant cartridge case that can relatively easily be reloaded with primers, powder and bullets and hence be reused several times it has become quite popular amongst wildcatters. With the 8mm Remington Magnum as the parent case wildcatters have created 6.35 mm (0.257 in) (.257 STW), 6.5 mm (0.264 in) (6.5 mm STW), .30 caliber (.30–8mm Remington Magnum, .300 Jarrett), 8 mm caliber (8 mm Jarrett), .338 caliber (.338 Jarrett), 0.358 in caliber (.358 STA) and 9.53 mm (0.375 in) (.375 JRS [John R. Sundra]) variants.
.358 STA (Shooting Times Alaskan)
Another brainchild of Layne Simpson, the .358 STA is an 8mm Remington Magnum case necked up to accept .358 Caliber bullets with the shoulder angle changed from 25 degrees to 35 degrees and body taper removed to maximize powder capacity. Able to propel a 300 grain bullet at over 2700 feet per second for 4,900 ft.-lbs. of energy, the .358 STA is a formidable big game cartridge. It has never emerged as a production cartridge and has had very limited success as a wildcat, overshadowed by the more popular .375 caliber commercial and custom cartridges.
See also
References
- ^ "Remington". Archived from the original on 2007-03-29. Retrieved 2007-03-29.
- ^ "Nosler". Archived from the original on 2009-04-22. Retrieved 2018-09-27.
- ^ a b "8mm Rem data from Accurate Powder" (PDF). Archived from the original (PDF) on 2008-10-06. Retrieved 2007-08-20.
- ^ Hodgdon Data Manual 26th Edition
- ^ C.I.P. TDCC sheet 8 mm Rem. Mag.
- ^ ANSI/SAAMI Velocity & Pressure Data: Centerfire Rifle Archived 2013-07-02 at the Wayback Machine
- ^ "What is the maximum length of a spin stabilized projectile? by B. Kneubühl" (PDF). Archived from the original (PDF) on 2007-11-27. Retrieved 2007-11-18.