.378 Weatherby Magnum
One of the first cartridges by Roy Weatherby
was the .375 Weatherby Magnum, an improved version of the
.375 H&H
Magnum. Weatherby's .375 was a good cartridge but it beat Holland's .375
by only about 100 fps. In 1953 Roy dropped the .375 and introduced the .378
Magnum. Despite nomenclature, bullet diameter remained the same. But the
same cannot be said about velocity; the .378 pushes a 300 grain bullet along
at close to 3000 fps.
The .378 Weatherby Magnum was inspired by the
.416 Rigby
case which is quite similar in dimensions but without a belt. Roy added the
belt because all his other cartridges had one. Among American designed big
game cartridges, only the .416 and
.460 Weatherby
Magnums, cartridges identical to the .378 except for caliber, burn more
powder.
The .378 Weatherby Magnum is an extremely powerful cartridge. When loaded
with a Nosler 300 grain Partition bullet,
it is suitable for use on any big game animal in the world, but the shooter
has to pay a price for such performance; the .378's recoil is far too vicious
for all but the most seasoned shooters.
Source: Hodgdon Data Manual, 26th Edition
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