450 Watts Magnum
Historical Notes:
The 450 Watts Magnum is made by necking up the 375 H&H
Magnum brass to accept .458 inch bullets. According to Mr. Ackley, it was
originated by a Mr. Watts and Mr. Anderson of Yakima, Washington. It dates back
to the 1950's or earlier. The case is .35 inch longer than the 458
Winchester Magnum. Because it holds more powder, it can be loaded to
slightly higher velocity than the 458 Winchester Magnum.
General Comments:
The 450 Watts Magnum is a powerful cartridge that can push a 500 grain bullet a
couple of hundred fps higher than the 458 Winchester Magnum.
However, the 458 is a more practical choice because
ammunition and rifles are readily available on a commercial basis. The
difference in power is not that great and the two will handle the same range of
big game. Guns so chambered can shoot 458 Winchester Magnum
loads.
Source: Cartridges of the World
| 450 Watts Magnum Reloading Data | ||||
|---|---|---|---|---|
| Bullet (grs.) | Powder / (grs.) | MV | ME | Source |
| 400 SP | IMR 4198 / 85.0 | 2670 | 6320 | Ackley |
| 500 SP | IMR 4320 / 98.0 | 2500 | 6920 | Ackley |
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