Buy .378 WBY MAG Ammo for Sale
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Weatherby Select Plus 378 Weatherby Mag 270 grain Barnes TTSX Rifle Ammo, 20/Box - B378270TSX
Brand:
Weatherby
Bullet Type:
BARNES TSX
Caliber:
.378 WBY MAG
Grains:
270 grain
Rounds:
20
(0)
Weatherby Select Plus 378 Weatherby Mag 300 grain Round Nose-Expanding Rifle Ammo, 20/Box - H378300RN
Brand:
Weatherby
Bullet Type:
Round Nose Expanding
Caliber:
.378 WBY MAG
Grains:
300 grain
Rounds:
20
(9)
Weatherby Select Plus 378 Weatherby Mag 270 grain Spire Point Rifle Ammo, 20/Box - H378270SP
Brand:
Weatherby
Bullet Type:
Spire Point
Caliber:
.378 WBY MAG
Grains:
270 grain
Rounds:
20
(0)
Weatherby Select Plus 378 Weatherby Mag 300 grain Full Metal Jacket Rifle Ammo, 20/Box - H378300FJ
Brand:
Weatherby
Bullet Type:
Full Metal Jacket
Caliber:
.378 WBY MAG
Grains:
300 grain
Rounds:
20
Marketplace Insights
★ 4.9/5
based on 17 customer reviews across 4 variants from 13 retailers
Customers praise the 378 Weatherby for outstanding accuracy and devastating hunting power, though premium ammunition costs are a notable concern.
What customers like
Exceptional accuracy53%
3-2shot groups at 100 averaged .312 inches
Powerful hunting performance71%
One shot kills when hunting boar is guaranteed
Long-range capability41%
As a long range caliber it's hard to beat the 378 weatherby
Superior stopping power35%
The 378 Wby has the punch of a 500 NE and the trajectory of a 300 Win mag
Common concerns
High ammunition cost12%
At almost $10 per round
Overkill for smaller game12%
not so much the little whitetails my crazy American neighbor shoots with it
Frequently Asked Questions
Buy .378 WBY MAG Ammo for Sale
What is the recoil of a 378 Weatherby Magnum felt?
The .378 Weatherby generates around 77 foot-pounds of recoil from a 9-pound rifle. Shooters describe it as brutal and fatiguing without a muzzle brake. A brake reduces felt recoil significantly, and a quality recoil pad with proper technique helps manage the sharp impulse.
What was Roy Weatherby's favorite caliber?
Roy Weatherby's personal favorite was the .257 Weatherby Magnum. He created it in the 1940s and officially introduced it in 1948. Known for exceptional velocity and flat trajectory, it remains one of Weatherby's signature cartridges and among the fastest commercially produced .25-caliber rounds.