Buy .338-378 WBY MAG Ammo for Sale
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Weatherby Select Plus 338-378 Weatherby Mag 225 grain Barnes TTSX Rifle Ammo, 20/Box - B333225TTSX
Brand:
Weatherby
Bullet Type:
Barnes Tipped TSX Lead Free
Caliber:
.338-378 WBY MAG
Grains:
225 grain
Rounds:
20
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HSM Trophy Gold 300 gr MHOTMT .338-378 Weatherby Mag Ammo, 20/box - BER-338378Wby300OTM
Brand:
HSM Ammunition
Bullet Type:
Berger Hybrid Tactical Open Tip Match (BHTOTM)
Caliber:
.338-378 WBY MAG
Grains:
300 grain
Rounds:
20
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Weatherby Select Plus 338-378 Weatherby Mag 250 grain Partition Rifle Ammo, 20/Box - N333250PT
Brand:
Weatherby
Bullet Type:
Nosler Partition
Caliber:
.338-378 WBY MAG
Grains:
250 grain
Rounds:
20
(0)
Weatherby Barnes 225 gr Triple-Shock X .338-378 Weatherby Mag Ammo, 20/box - B333225TSX
Brand:
Weatherby
Bullet Type:
Barnes Triple Shock X
Caliber:
.338-378 WBY MAG
Grains:
225 grain
Rounds:
20
Marketplace Insights
★ 4.9/5
based on 8 customer reviews across 4 variants from 15 retailers
Hunters praise this caliber's exceptional accuracy, power, and effectiveness on large game, but consistently lament limited ammunition availability.
What customers like
Accuracy Performance63%
3 shots you an cover with a quarter!
Effective on Big Game63%
all 3 stop right there, same thing on black bear
Powerful Caliber50%
Whatever I want at whatever distance I want
Manageable Recoil25%
Acceleration is easily manageable with muzzle break
Common concerns
Ammunition Availability50%
just wish the ammunition was more attainable here
Frequently Asked Questions
Buy .338-378 WBY MAG Ammo for Sale
What is the effective range of a 338-378 Weatherby magnum?
Effective range depends on intended use. For hunting large game like elk, reliable performance extends to around 600 yards. Long-range target shooters use the .338-378 beyond 1,000 yards. Its high velocity and heavy bullet weight support extended-range applications when properly zeroed and loaded.
What is 338-378 Weatherby?
The .338-378 Weatherby Magnum is a rifle cartridge released by Weatherby in 1998. Based on the .378 Weatherby case necked down to .338 caliber, it exceeds the .338 Lapua in case capacity and velocity. Weatherby chambers it in the Mark V rifle, and four variants are currently produced.
What is the difference between 338 Lapua and 338 378 Weatherby magnum?
The .338-378 Weatherby holds more powder (125 gr water capacity vs. 114.2 gr), generating roughly 150-200 fps more velocity. Weatherby uses a belted case; Lapua doesn't, giving Lapua better case life and feeding. Weatherby ammunition is more regionally available; Lapua is more widely stocked internationally.