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.458 Winchester Magnum
Munit02.jpg
.458 third from right
Type Rifle / Hunting
Place of origin USA
Production history
Designer Winchester
Designed 1956
Specifications
Parent case .375 H&H Magnum
Case type Belted, tapered
Bullet diameter .459 in (11.7 mm)
Neck diameter .481 in (12.2 mm)
Base diameter .513 in (13.0 mm)
Rim diameter .532 in (13.5 mm)
Rim thickness .220 in (5.6 mm)
Case length 2.500 in (63.5 mm)
Overall length 3.340 in (84.8 mm)
Rifling twist 1-14"
Primer type Large rifle magnum
Ballistic performance
Bullet weight/type Velocity Energy
300 gr (19 g) HP 2,606 ft/s (794 m/s) 4,525 ft·lbf (6,135 J)
350 gr (23 g) RN 2,557 ft/s (779 m/s) 5,083 ft·lbf (6,892 J)
400 gr (26 g) FN 2,468 ft/s (752 m/s) 5,411 ft·lbf (7,336 J)
500 gr (32 g) RN 2,192 ft/s (668 m/s) 5,336 ft·lbf (7,235 J)
Test barrel length: 26"
Source: Accurate Powder [1]

The .458 Winchester Magnum is a rifle cartridge introduced 1956 by Winchester. The cartridge case is based on the .375 H&H case shortened to 2.5 in (64 mm), and "blown out" (case opening enlarged) to accept a bullet of .458 inch (11.6 mm) diameter. The cartridge headspaces on the belt. The developers of the .458 Winchester Magnum sought to duplicate the ballistics of the 450 Nitro Express and 470 Nitro Express, in a cartridge that would fit in a standard bolt-action rifle. With good handloads one can expect approximately 2,170 feet (660 m) per second (660 m/s) using 500 grain (32.4 g) bullets (achieved using a barrel 24 inches (610 mm) in length). Though somewhat overpowered for North American game like deer and elk, the .458 is most useful for African game like Cape buffalo and lions. The 458 Winchester Magnum is the largest of a family of "short magnums" that include the .338 Winchester Magnum, .264 Winchester Magnum, and later the .300 Winchester Magnum.

Winchester currently offers ammunition in the traditional 510 gr (33 g) Soft Point and the new 500 gr (32 g) Nosler Partition and Nosler Solid. The Winchester 500 gr (32 g) loading has a muzzle velocity of 2,240 ft/s (680 m/s) and muzzle energy of 5570 foot pounds. Hornady offers what they call a "heavy magnum" loading that features a 500 grain (32.4 g) bullet with a velocity of approx 2,260 feet (690 m) per second (690 m/s). They use a special double-based cooler burning propellant ("powder") not available to the public for handloading. This innovative loading allows the .458 Winchester Magnum to attain 5670 foot pounds of muzzle energy. Federal Cartridge is now loading a 500-grain (32 g) Barnes X bullet with a sectional density and ballistic coefficient that allows it to maintain approximately 2000 foot pounds of energy at 500 yards (460 m) and a flatter trajectory that has never been attained with this cartridge and bullet weight. Numerous companies offer rifles in this caliber, including the Winchester Model 70.

The rounds for the .458 Win mag are more expensive than cartridges like the popular .30-06, making handloading a worthwhile effort. Though more expensive than deer hunting ammunition, the .458 Winchester Magnum is significantly less expensive than its competitors. For many decades the .458 has been the most popular rifle cartridge of professional hunters who pursue heavy dangerous game in Africa because of its performance, price, and availability. When British ammunition companies, including Kynoch, began closing in the 1960s, Winchester and the .458 Winchester Magnum filled the gap left behind.

The recoil of the factory loads is about 70 foot pounds. Handloads can be made that will make this cartridge more comfortable to shoot, for example using a 300-grain (19 g) cast lead bullet at 1,282 ft/s (391 m/s). This loading mimics the 45/70 in both power and recoil.[2][1]

See also

In media

  • The use of a .458 chambered rifle in the hunting down of a rogue elephant in Assam, India is described in To the Elephant Graveyard, by Tarquin Hall.
  • The .458 is the cartridge choice for the hunter Jacques LaFleur in the movie Harry and the Hendersons.

References

  1. ^ a b ".458 Win Mag data" from Accurate Powder
  2. ^ ".458 Win mag data" from Hodgdon







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