Weatherby .338-378 Weatherby Magnum ammunition is engineered for extreme long-range performance, delivering exceptional velocity, flat trajectory, and terminal effectiveness for serious big-game applications.
The Weatherby .338-378 Weatherby Magnum is built on a high-capacity belted magnum case designed to maximize velocity and downrange energy. Introduced in 1998, this cartridge is renowned for its ability to drive heavy .338 caliber projectiles at very high speeds, making it suitable for extended-range hunting where penetration and retained energy are critical. Its optimized case length and bullet diameter contribute to consistent accuracy and reliable performance in magnum-class rifles chambered specifically for this caliber.
Key Features
Caliber: .338-378 Weatherby Magnum Bullet Diameter: .338" (8.6 mm) Design: High-velocity belted magnum cartridge Application: Long-range big-game hunting Performance Focus: Flat trajectory and high retained energy
All Technical Data
Cartridge Type: Centerfire rifle ammunition Caliber: .338-378 Weatherby Magnum Common Reference: .338 caliber Bullet Diameter: .338" (8.6 mm) Maximum Case Length: 2.913" (≈ 74.0 mm) Production Start: 1998
Why Choose This Product?
The Weatherby .338-378 Weatherby Magnum stands out for hunters who demand extreme-range capability, combining impressive velocity with heavy-hitting terminal performance for challenging big-game pursuits.
Service très rapide merci
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Very fast service, thank you.
Jean-Pierre Gagnon
15 Oct 2025
J’ai commandé via le site Internet de Londero Sports une boîte de munitions (calibre 270) que je trouvais pas ailleurs… Livraison super rapide! Je recommande sans hésiter.
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I ordered a box of ammunition (270 caliber) through the Londero Sports website, which I couldn't find anywhere else... Super fast delivery! I recommend it without hesitation.
normand gravel
11 Oct 2025
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I needed a part express and it went very well. 2 days and it was sorted. Good service.
Antony Theroux-laroche
10 Oct 2025
Mustang Qc
01 Oct 2025
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Great service and good prices
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26 Sep 2025
Londero was recommended, filled a basket, asked for help in located an item, quick email response, order placed, order shipped that day, and the package ???? made its was from QC to the southern most part of Canada in 2 days.
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22 Sep 2025
Excellent service !
Rapide et efficace, good Job
(Translated by Google)
Excellent service!
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16 Sep 2025
I have recently made multiple purchases online with Londero Sports and they have been very, very quick on sending the parcels. Very happy with our purchases and service. Will be back for more.
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15 Sep 2025
Provost Mario
15 Sep 2025
Jonathan Laplante
12 Sep 2025
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Eric Duc
05 Sep 2025
guerroumi smail
04 Sep 2025
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Very happy with my order! The speed of receipt was very fast and appreciated.
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03 Sep 2025
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English 
Service très rapide merci (Translated by Google) Very fast service, thank you.