220 Weatherby Rocket
Historical Notes:
The 220 Rocket is the only Weatherby development for which loaded factory
ammunition or empty cases are not available. For this reason, it must be placed
in the wildcat cartridge category. Developed in 1943 by the late Roy Weatherby,
it was the first in the long line if his excellent and successful cartridges.
However, it has never been very popular, and Weatherby rifles in this caliber
are now available only on special order. It is important primarily as the
beginning of the Weatherby ammunition line and as the initial stimulant to a
career of rifle and cartridge manufacture that has had a considerable impact on
American thinking.
General Comments:
The 220 Rocket is actually one of a number of improved wildcat cartridges based
on the 220 Swift
case. The Ackley and Kilbourn versions are similar to the Weatherby, and none
have any particular advantage over the other. Also, none of them are
sufficiently superior to the original 220
Swift to offer anything of outstanding value insofar as performance is
concerned. As is typical with improved cartridges where the original design
features significant body taper, the improved Swift extracts somewhat easier
and, with proper headspacing, gives longer case life.
Source: Cartridges of the World
| 220 Weatherby Rocket Reloading Data | ||||
|---|---|---|---|---|
| Bullet (grs.) | Powder / (grs.) | MV | ME | Source |
| 50 SP | IMR 3031 / 40.0 | 4005 | 1775 | Ackley |
| 55 SP | IMR 3031 / 39.0 | 3767 | 1730 | Ackley |
| 55 SP | IMR 3031 / 42.0 | 3860 | 1820 | Ackley |
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