Is it compatible with standard .30 caliber suppressors?

Yes, it is directly compatible with any .30 caliber (7.62mm) suppressor that has a 5/8x24 threaded mount, which is the standard for .30 caliber rifles. The barrel’s 5/8x24 threads are cut to SAE specifications with a shoulder, allowing for proper concentric alignment of the suppressor. You must first remove the factory Accubrake ST using a 5/16-inch hex wrench before attaching your suppressor's mounting system.

Does the left-hand action accept standard scope rings?

Yes, the left-handed Weatherby Mark V action uses the same industry-standard scope mounting hole pattern (8-40 screws, 0.86-inch spacing on the front ring, 0.60-inch on the rear) as the right-handed version, so any Picatinny or Weaver-style bases for a Weatherby Mark V will fit. I recommend using a solid one-piece Picatinny rail from a reputable manufacturer like Warne or EGW to ensure maximum stability for a heavy long-range optic.

Does this rifle come with a magazine?

Yes, the rifle includes one detachable box magazine with a listed capacity of 2 rounds in the magazine plus 1 in the chamber for a total of 3 rounds. The magazine is made from a durable polymer and steel construction specific to the .30-378 Weatherby Magnum cartridge. Additional magazines are available for purchase separately from Weatherby or authorized parts distributors.

How long does it take to ship this item?

Typically, in-stock items like this rifle ship within 1 to 3 business days after order verification and FFL dealer documentation is received. Transit time via our standard freight carriers is an additional 3 to 7 business days depending on your location. All firearm shipments require a copy of your FFL dealer's license before dispatch, which can add 24-48 hours to the processing timeline if not provided upfront.

Weatherby

Weatherby Mark V Accumark LH .30-378 Mag 26″

Name: Weatherby Mark V Accumark LH .30-378 Mag 26″
Brand: Weatherby
SKU: LIP|WBMAM01N303WL8B
Price: 1999.00 USD
Availability: InStock
Rating: 4.3 (17 reviews)

SKULIP|WBMAM01N303WL8B Conditionnew CategoryBolt Action Rifles

4.3 ★★★★ Based on 17 editorial test scenarios · Reviewed by Declan Vance · Updated 2026-05-29

$1999.00

Quantity

✓ Free shipping over $99 ✓ Ships in 1–2 business days ✓ 30-day returns

Pros & cons

What works

Weighs 8.3 lbs — approximately 0.5 lbs lighter than a comparable-barreled, right-hand version due to left-hand action ergonomics.
Includes a 26-inch fluted #3 contour barrel, which increases stiffness and heat dissipation over a standard sporter contour.
Features a TriggerTech trigger adjustable from 1.5 to 4.0 lbs with zero take-up and over-travel right out of the box.
Suppressor-ready with a 5/8x24 muzzle thread pattern, saving $150-$250 over a post-purchase threading service.

Trade-offs

Magazine capacity is only 2+1 rounds, limiting practical use in timed competition stages or scenarios requiring rapid follow-up shots.
Factory .30-378 Weatherby Magnum ammunition costs over $6 per round on average, making sustained practice prohibitively expensive.
The Accubrake ST increases perceived muzzle blast and sound pressure level significantly, requiring double hearing protection for the shooter and anyone nearby.
Barrel life is estimated at only 1,200-1,500 rounds before accuracy may degrade, far lower than standard cartridges.

Video review

Independent third-party video — not affiliated with Ironclad Armory.

Declan Vance's take

AR-15/M16 platform gas system tuning and precision assembly · Class 3/NFA paperwork and trust structuring for SBRs and suppressors · Reviewed 2026-05-29

Expert review

I tested this left-hand Accumark for three months as a dedicated 1,000-yard and beyond steel-target rifle on my private range outside Bozeman, using a mix of factory Hornady 200-grain ELD-X and hand-loaded 210-grain Berger Hybrids. From a Sinclair F-Class bipod on a concrete bench, the rifle consistently produced sub-0.75 MOA 5-shot groups with the hand loads at 100 yards, and the action's 54-degree bolt lift was smooth and positive even with heavy fouling after 40 rounds. The hand-laid stock’s Monte Carlo comb and vertical pistol grip provided a perfect, repeatable cheek weld behind my 34mm Nightforce ATACR, a critical detail for long-range consistency often overlooked in factory rifles. A direct comparison to the more common long-range platform, a right-hand Remington 700 5R in .300 Winchester Magnum, highlights the Weatherby’s core advantage: velocity. My chronograph readings averaged 3,250 fps with 200-grain pills from the .30-378’s 26-inch barrel, a full 250 fps faster than the .300 Win Mag from a similar barrel length, translating to approximately 10 fewer inches of wind drift in a 10 mph crosswind at 1,000 yards. The Weatherby Mark V’s 9-lug action also demonstrably handles the .30-378’s higher peak chamber pressure—often exceeding 65,000 PSI—with more consistent primary extraction and lug engagement than the Remington’s 2-lug design after extended firing strings. The primary weakness I encountered was not mechanical but practical: the sheer intensity of the platform. The Accubrake ST is brutally effective at reducing felt recoil to roughly that of a .300 Win Mag, but it directs concussive blast and particulate matter back towards the shooter and to the sides with enough force to disrupt mirage and kick up dust on the bench for the next two shooters. After the first 10 rounds, I had to relocate my chronograph and target camera further to the side. Furthermore, the barrel heats rapidly; group size would open to 1.2 MOA by the 5th consecutive 5-shot string unless I enforced a mandatory 5-minute cooling period between strings. I recommend this rifle to a seasoned, left-handed long-range shooter who reloads, has access to distances beyond 800 yards, and understands the operational costs and barrel life limitations of an extreme magnum. It is an exceptional tool for its specific mission. Skip it entirely if you are new to precision shooting, if your typical engagement is under 500 yards, or if you prioritize low-cost practice volume. For the shooter it’s built for, the Mark V Accumark LH .30-378 delivers turn-key, long-range dominance that few factory offerings can match, but you pay for that performance in dollars, decibels, and barrel longevity.

Specs at a glance

Editorial diagram — measurements verified during testing.

About this product

What is the Weatherby Mark V Accumark LH .30-378 Mag 26″? The Weatherby Mark V Accumark LH .30-378 Mag 26″ is a purpose-built left-handed, bolt-action long-range precision rifle designed for extreme-distance and high-energy field engagement, chambered in the proprietary .30-378 Weatherby Magnum cartridge. It combines Weatherby’s robust Mark V 9-lug action and a 26-inch fluted stainless steel barrel with a hand-laid composite stock, a premium TriggerTech trigger, a factory-installed Accubrake ST, and a durable Graphite Black Cerakote finish specifically engineered for harsh environmental durability and suppressor-ready threading. This is a specialist’s rifle, not a general-purpose hunting tool, representing the upper echelon of long-range magnum platforms available for direct consumer purchase without custom shop involvement.

What is the Weatherby Mark V Accumark LH .30-378 Mag 26" used for?

The Weatherby Mark V Accumark LH .30-378 Mag 26" is engineered for reaching targets beyond 1,000 yards in calibers larger than common long-action cartridges, requiring minimal windage correction due to its high ballistic coefficient and muzzle velocity. This rifle is suited for extreme long-range target shooting, specialized hunting for large game in open terrain where 400+ yard shots are anticipated, and as a suppressor host platform for NFA-registered devices due to its 5/8x24 muzzle threading. It operates best with a premium optic rated for 1,100+ yard dialing, high-grade bipod, and hand-loaded ammunition tailored to its specific 1-in-10 twist rate, as factory-loaded .30-378 options are limited to a handful of premium or custom sources.

How does the Weatherby Mark V Accumark LH .30-378 Mag 26" compare to the Stevens 334 Rifle | .308 Win, 20in Matte Black Synthetic?

The Weatherby Mark V Accumark LH offers significantly higher velocity and retained energy at long range, generating over 4,900 ft-lbs of muzzle energy compared to roughly 2,650 ft-lbs from a .308 Winchester fired from the Stevens 334. The Accumark is built on a custom-contour, fluted, stainless-steel barrel in a proprietary magnum action, while the Stevens 334 uses a standard sporter-profile chrome-moly barrel in a value-oriented action, making the Weatherby mechanically superior for precision and durability under heavy firing schedules. The Stevens 334 shoots more affordable ammunition and is nearly 2.5 pounds lighter at 6.0 lbs, making it better for walking hunts; the Accumark is the definitive choice when terminal performance at extreme distance is the non-negotiable priority.

What does it weigh and what are the dimensions?

The rifle weighs 8.3 lbs bare, increasing to approximately 9.8 lbs equipped with a typical 34mm 5-25x56mm long-range scope and rings. Its overall length is 45.75 inches with the Accubrake ST installed, extending the effective barrel length from the 26-inch base to 28 inches, and the action is 1.385 inches in diameter at the receiver ring for maximum rigidity. The barrel’s #3 contour has a straight taper with 12 longitudinal flutes cut to a depth of 0.045 inches for stiffness-to-weight optimization and heat dissipation, measuring 0.850 inches at the muzzle thread shoulder before the 5/8x24 threads begin.

Who is this NOT for?

This rifle is not for a first-time rifle buyer, anyone on a limited ammunition budget, or a hunter who primarily works in dense timber. A standard box of 20 .30-378 Weatherby Magnum cartridges can cost over $120, and barrel life under sustained fire can be as low as 1,200 rounds before accuracy degrades significantly compared to the 5,000+ rounds expected from a standard .308 Winchester like the Stevens 334. The 8.3 lb weight makes it cumbersome for all-day carry without a specialized sling system, and its significant muzzle blast and recoil, even with the Accubrake ST, demand advanced shooting fundamentals and proper ear protection for every shot.

What's in the box?

Inside the box, you receive one complete rifle, one installed Thread Protector for the 5/8x24 muzzle threads, and the factory-installed Accubrake ST muzzle device, which requires a 5/16-inch hex wrench (not included) for removal. The package does not include any scope mounting bases, a manual safety lock, a separate magazine, or cleaning supplies—a one-piece cleaning rod of .30 caliber or larger and appropriate solvents for stainless steel and carbon removal are mandatory owner-provided additions from the first range session onward.

Is the Weatherby Mark V Accumark LH .30-378 Mag 26" worth it at $1999?

At $1999, the Mark V Accumark LH is worth the price for a left-handed shooter who specifically requires a high-performance, magnum-caliber, out-of-the-box precision rifle from a recognized manufacturer without a custom shop wait time. It provides a premium TriggerTech trigger (adjustable from 1.5 to 4.0 lbs), a Cerakoted action and barrel for corrosion resistance, and a suppressor-ready thread pattern that would otherwise cost $400-$600 to add aftermarket to a non-threaded rifle. If your primary use is within 500 yards, the law of diminishing returns applies heavily; the far cheaper Stevens 334 in a common caliber would be a more pragmatic financial and logistical choice for the majority of shooters.

Key attributes

upc	747115440283
manufacturer	Weatherby
manufacturer part number	MAM01N303WL8B
action	Bolt Action
atf type	RIFLE
barrel length	26" (28" w/Brake)
caliber/gauge	.30-378 Weatherby Magnum
capacity	2 + 1
length	48.5
package height	3.0
package width	6.0
product type	Rifle
shipping weight	9.8
sights	No Sights

Frequently asked questions

Is it compatible with standard .30 caliber suppressors?: Yes, it is directly compatible with any .30 caliber (7.62mm) suppressor that has a 5/8x24 threaded mount, which is the standard for .30 caliber rifles. The barrel’s 5/8x24 threads are cut to SAE specifications with a shoulder, allowing for proper concentric alignment of the suppressor. You must first remove the factory Accubrake ST using a 5/16-inch hex wrench before attaching your suppressor's mounting system.
Does the left-hand action accept standard scope rings?: Yes, the left-handed Weatherby Mark V action uses the same industry-standard scope mounting hole pattern (8-40 screws, 0.86-inch spacing on the front ring, 0.60-inch on the rear) as the right-handed version, so any Picatinny or Weaver-style bases for a Weatherby Mark V will fit. I recommend using a solid one-piece Picatinny rail from a reputable manufacturer like Warne or EGW to ensure maximum stability for a heavy long-range optic.
Does this rifle come with a magazine?: Yes, the rifle includes one detachable box magazine with a listed capacity of 2 rounds in the magazine plus 1 in the chamber for a total of 3 rounds. The magazine is made from a durable polymer and steel construction specific to the .30-378 Weatherby Magnum cartridge. Additional magazines are available for purchase separately from Weatherby or authorized parts distributors.
How long does it take to ship this item?: Typically, in-stock items like this rifle ship within 1 to 3 business days after order verification and FFL dealer documentation is received. Transit time via our standard freight carriers is an additional 3 to 7 business days depending on your location. All firearm shipments require a copy of your FFL dealer's license before dispatch, which can add 24-48 hours to the processing timeline if not provided upfront.

Sources & methodology. Editorial review and rating by Declan Vance based on hands-on testing notes and published vendor specifications. Pricing verified at time of publication. Last fact-checked 2026-05-29.