I have heard that a .300 H&H cartridge can be fired in a .300 Weatherby chamber. Is this true?
The .300 Weatherby Magnum cartridge case was originally formed by “blowing out” .300 H&H Mag. brass in a chamber cut to .300 Weatherby dimensions. Now, of course, .300 W. Mag. is manufactured from virgin brass, just like any other factory load. But you can still fire .300 H&H cartridges in a .300 Weatherby chamber. The brass will (usually) stretch to fit the larger chamber. You will get .300 H&H ballistics, of course.
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