Description
Before synthetic stocks and Cerakote took over the rifle rack, a Weatherby meant rich walnut and deep blued steel. The Mark V Deluxe keeps that tradition alive, and this one is chambered in 378 Weatherby Magnum, the big case Roy Weatherby designed for the largest game on the planet. It pushes heavy bullets at velocities that flatten trajectories most people would not expect from a true big bore, which is why it has earned its keep on African plains game, brown bear, and anything else that requires deep penetration and real authority.
The Walnut and Blue Steel Weatherby Fans Remember
The gloss AA walnut stock wears fineline diamond point checkering, a rosewood forend and grip cap with maplewood spacers, and the classic Monte Carlo comb that lines your eye up naturally behind a scope. A Pachmayr Decelerator pad sits at the back, and combined with the factory installed AccuBrake ST up front, the 378 becomes far more pleasant to run than its reputation suggests. The Mark V action itself is the famous nine lug design with a short 54 degree bolt lift, built specifically to contain big magnum cartridges while cycling fast and smooth.
Mark V Deluxe 378 Wby Performance Details
The 26 inch #3 contour barrel carries a high gloss blued finish and a 1:12 right hand twist suited to the heavy bullets this cartridge was born to throw. The muzzle is threaded 5/8×24, so you can run the included brake or swap devices as you see fit. There are no iron sights, but the receiver is drilled and tapped, and Weatherby backs the rifle with its sub-MOA accuracy guarantee using qualifying ammunition. Capacity is 2+1, standard fare for a cartridge with a case this large.
At 8.25 pounds bare and 48.75 inches overall with the brake, this rifle carries its weight where you want it for steady offhand shots and soaking up recoil. It is the kind of rifle that gets handed down, not traded in, and in 378 Wby it is ready for the biggest hunts you will ever book.
Key Specifications
- Manufacturer Part Number: MDX01N378WR8B
- UPC: 747115440986
- Caliber: 378 Weatherby Magnum
- Action: Bolt Action, 9-lug Mark V with 54 degree bolt lift
- Capacity: 2+1 Rounds
- Barrel: 26" #3 Contour, High Gloss Blued, Threaded 5/8×24
- Muzzle Device: AccuBrake ST (28" barrel OAL with brake)
- Twist Rate: 1:12" RH
- Stock: Gloss AA Walnut Monte Carlo, Rosewood Forend and Grip Cap
- Recoil Pad: Pachmayr Decelerator
- Trigger: TriggerTech
- Sights: None, Receiver Drilled and Tapped
- Length of Pull: 13.5"
- Overall Length: 48.75"
- Weight: 8.25 lbs
- Accuracy: Sub-MOA Guarantee with Qualifying Ammunition
What’s Included
- Weatherby Mark V Deluxe rifle with factory installed AccuBrake ST
- Owner's manual
- Cable lock
- Factory box
Frequently Asked Questions
How bad is the recoil on the Mark V Deluxe in 378 Weatherby Magnum?
The 378 Wby is a stout cartridge, no way around that, but this rifle is set up to tame it. The factory AccuBrake ST knocks down a significant amount of felt recoil, the Pachmayr Decelerator pad takes the sting off your shoulder, and the 8.25 pound weight plus Monte Carlo stock design help manage muzzle rise. Most people find it very shootable with the brake installed.
What is the 378 Weatherby Magnum best suited for?
This is a true big game cartridge, launching heavy .375 caliber bullets at impressive velocities. It shines on African plains game and dangerous game hunts, large bears, and any situation where deep penetration and heavy energy delivery matter. It is more cartridge than you need for deer, but for the biggest animals out there it is right at home.
Does the Weatherby Mark V Deluxe come with sights or a scope?
No, this model ships without iron sights or optics. The receiver comes drilled and tapped from the factory, so mounting bases and a scope is straightforward. Given the reach of the 378 Wby, a quality magnum-rated scope with sturdy rings is the way to go.
Is the Mark V Deluxe covered by Weatherby's accuracy guarantee?
Yes, Weatherby backs the Mark V line with a sub-MOA guarantee, meaning a three shot group under an inch at 100 yards using qualifying Weatherby factory or premium ammunition. That is impressive performance from a big bore hunting rifle wearing traditional walnut furniture.



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