The original specifications for the cartridge called for a 510 gr (33 g) bullet to be fired at a velocity of 2,150 ft/s (660 m/s) through a 26 in (660 mm) barrel. while the CIP mandates a maximum pressure of 4,300 bar (62,000 psi). Maximum recommended pressure given by SAAMI is 53,000 c.u.p. While case volume varies between manufacturers, the typical Winchester case capacity is 95 grain of H 2O (6.17 cm 3). 458 in (11.63 mm) with each groove having an arc length of. SAAMI recommends a 6 groove with a twist ratio of 1:14 with a bore Ø of. The cartridge remains the largest of the standard length magnum cartridge family released by Winchester, which includes the somewhat obsolete. 375 H&H case shortened to 2.5 in (63.5 mm) and renecked (to reduce taper) to accept a. 458 Winchester Magnum's case was based on a. 458 Winchester Magnum cartridge schematic: All dimensions in inches. 458 Winchester Magnum called for it to launch a 510 gr (33.0 g) bullet at 2,150 ft/s (655 m/s) out of a 26 in (660 mm) barrel. 450 Nitro Express had been rated to launch a 480 gr (31.1 g) bullet at 2,150 ft/s (655 m/s) out of a 28 in (711 mm) barrel while the. 470 Nitro Express, which had become the mainstay of African dangerous game hunters. 458 Winchester Magnum was designed from the outset to duplicate the performance level of the. 416 cartridges have gained wider acceptance, but the 458 Win Mag remains one of the popular choices. 458 Winchester Magnum remained the standard of measure for dangerous game cartridges. While Winchester addressed this issue, the stigma remained, and the cartridge's performance on dangerous game was suspect. Due to clumping of the powder charge and the erratic burn characteristics associated with such loads, performance of the cartridge came into question. Winchester had been using compressed loads of ball powder as a propellant for. īy 1970 issues with the cartridge began to surface. The cartridge would become the standard African dangerous game cartridge in short order. 458 Winchester Magnum as their duty rifle. Soon game wardens, wildlife managers, and professional hunters switched to the. 458 Winchester Magnum soon became a success as dangerous game hunters adopted the cartridge. The use of a bolt-action rifle offered hunters a cheaper alternative to the big-bore double rifle, and ammunition could be manufactured using available tooling. 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. 458 Winchester Magnum remains one of the most popular large game cartridges, and most major ammunition manufacturers offer a selection of. 470 Nitro Express cartridges used in big bore British double rifles. It was introduced commercially in 1956 by Winchester and first chambered in the Winchester Model 70 African rifle. 458 Winchester Magnum is a belted, straight-taper cased, big five game rifle cartridge.
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