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458 Win Mag Ammo
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.458 Winchester Magnum
- Type Rifle / Hunting
- Place of origin USA
- Production history
- Designer Winchester
- Designed 1956
- Parent case .375 H&H Magnum
- Case type Belted, tapered
- Bullet diameter .458 in (11.63 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
|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)|
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The .458 Winchester Magnum is a belted, straight-taper cased dangerous game rifle cartridge. It was introduced commercially in 1956 by Winchester and first chambered in the Winchester Model 70 African rifle. It designed to compete against the .450 Nitro Express and the .470 Nitro Express cartridges used in big bore British double rifles.
The .458 Winchester Magnum was designed for hunting dangerous game animals by emulating the performance of powerful English double rifle cartridges in a bolt-action rifle.