338-378 Weatherby Magnum

338-378 Weatherby Magnum

$167.00

In stock

Another Weatherby wildcat, first introduced in the 1960s. This is the ultimate cartridge for long-range, big game hunting.

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Another Weatherby wildcat, first introduced in the 1960s. This is the ultimate cartridge for long-range, big game hunting. Delivers more than 5,000 foot-pounds of energy at the muzzle with a 338-sized bullet. Extremely powerful and flat shooting. Based upon the 378 case, necked down to 338. Reintroduced as a Weatherby production cartridge in 1998.

BALLISTICS


Velocity

Bullet TypeBallistic Coefficient@ Muzzle100 Yards200 Yards300 Yards400 Yards500 Yards
225 Grain TTSX 0.514 3180 2974 2778 2591 2410 2238
250 Grain Partition 0.473 3060 2856 2662 2475 2297 2125

Energy

Bullet TypeBallistic Coefficient@ Muzzle100 Yards200 Yards300 Yards400 Yards500 Yards
225 Grain TTSX 0.514 5052 4420 3856 3353 2902 2501
250 Grain Partition 0.473 5197 4528 3933 3401 2927 2507

Trajectory

Bullet TypeBallistic Coefficient100 Yards200 Yards300 Yards400 Yards500 Yards
225 Grain TTSX 0.514 3.1 3.8 0.0 -8.9 -24.0
250 Grain Partition 0.473 3.5 4.2 0.0 -9.8 -26.4

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4 customer reviews

Average rating
(based on 4 reviews)
Value
Quality
Performance
  1. Very good ammo in my Accumark. The 250 grain Nosler Partition was accurate and make a awesome job on big game. I shoot 3 big moose's and all 3 stop right there, same thing on black bear. Like the other comment I just wish the ammunition was more attainabl

    By jeff50jd April 10, 2017

    Very good ammo in my Accumark. The 250 grain Nosler Partition as accurate and make a awesome job on big game. I shoot 3 big moose's and all 3 stop right there, same thing on black bear. Like the other comment I just wish the ammunition was more attainable here in Canada

  2. Outstanding Long Range Performance

    By Westward March 23, 2017

    As a gunsmith, firearms dealer, and long range rifle builder of over 40 years, it is a pleasure to report our extensive field testing of the .338-.378 Wby Mag factory loads. Our rifle is an Unlimited Class 18 pound engineering masterpiece with 28 match barrel and PTG muzzle brake. We are consistently keeping this high performance shooter under 1/2 MOA throughout the full extreme ranges here in Western Washington. Job well done. And if you would like to try your skills at over 1/2 mile, this is THE caliber.

  3. .338-378 wby mag long range

    By huntin howie March 04, 2017

    Awesome up to 1500 yds. for bear, moose, elk, and more

  4. acurrate and dependable cartridge

    By RHINOPENN March 14, 2015

    I have owned a mark V in this caliber for over 5yrs now, extremely happy with its performance here in northern BC Canada. It has anchored the biggest game we have here. From Bear,Moose,Elk. Out beyond 1100yrds. I just wish the ammunition was more attainable here in Canada.

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