The .378 Weatherby is an exceptionally good cartridge for hunting large game. But to utilize it the hunter must get past the initial grandeur of high power and see it for what it really is.
The .378 shares the double radius shoulder design found on the other Weatherby magnum cartridges. The impetus for the development of the .378 arose from Roy Weatherby's extensive field testing conducted in African hunting grounds.
The .378 Weatherby Magnum dates to 1953, when Roy Weatherby sought a significant power improvement over the .375 Holland & Holland and the .375 Weatherby. The basic H&H case was the fattest, longest case used for American rifle cartridges at the time, but Weatherby needed more.
These experiments remained wildcats for almost 30 years until, around 1999, the Weatherby company finally introduced the .338-378 Weatherby Magnum as a commercial cartridge. The .338-378 shoots a little flatter than the .340 Wby. Magnum, but in practical killing power there is little difference.
338-378 Weatherby Magnum rifles for large game hunting and long distance shooting.
Roy Weatherby’s 378 delivers 34 percent more energy at the muzzle than the powerful 375 H&H Magnum. Since 1955, the 378 has become one of the world’s most popular cartridges for the largest of big game animals.
IMR 4831 give excellent results. With its high ballistic coefficient, the 300 grain Spitzer boat tail at 2900 fps is an ext. emely flat shooting combination. For larger African plains ga. e, the 378 is powerful medicine. As with the other large Weatherby cartridges, we strongly sugge.
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