475 Ackley Magnum (475 OKH Magnum)
These two cartridges are listed together because they are virtually identical. Both can be formed by necking up the 375 H&H Magnum brass without any other change. The Ackley 475 Magnum originated in the middle 1950's. The bullet used is a Barnes 600 grain SP or Solid at a muzzle velocity of 2250 fps. The cartridge is normally chambered in bolt action rifles.
A 600 grain bullet at 2250 fps develops 6572 foot pounds of energy, making for a very powerful cartridge adequate for any dangerous African game. However, for those who like lots of energy and power the 475 Ackley/OKH is not as powerful as the 460 Weatherby or 475 H&H Magnum. In actual practice, it probably wouldn't make much difference because any of these cartridges is capable of dispatching an elephant or Cape buffalo with one shot. Of course, this has also been done with smaller calibers developing less energy. So in the final analysis, a great deal depends on the hunter and his skill. The cartridge is, of course, overpowered for North American big game.
Source: Cartridges of the World
|475 Ackley Magnum (475 OKH Magnum) Reloading Data|
|Bullet (grs.)||Powder / (grs.)||MV||ME||Source|
|600||IMR 4320 / 90.0||2250||6750||Ackley|
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