Is the barrel threaded for suppressors?

Yes, the 26-inch barrel features standard 5/8"-24 threading that accommodates most .30 caliber suppressors without adapter requirements. The threading extends 0.625 inches beyond the barrel contour, providing sufficient engagement for suppressor mounts like the SilencerCo Omega 300 or Dead Air Sandman series.

Does it include scope bases?

The rifle comes drilled and tapped for standard Weatherby #8 scope bases, which must be purchased separately from manufacturers like Talley, Leupold, or Warne. Installation requires properly torquing the base screws to 25 inch-pounds using a calibrated torque wrench to prevent shifting under heavy recoil.

How long is the shipping process?

Firearms ship within 3-5 business days after receiving your FFL dealer's information, with ground shipping typically taking 7-10 days to reach most continental US locations. All shipments require signature confirmation and transfer through a licensed FFL holder per ATF regulations.

Can I return it if there are mechanical issues?

Ironclad Armory accepts returns within 30 days for manufacturing defects, with Weatherby providing a lifetime warranty on the action and barrel. Returns require inspection by our armorers and typically process within 14 business days, though cosmetic issues from normal use don't qualify for return under warranty terms.

What twist rate is best for heavier bullets?

The 1:10 twist rate stabilizes bullets from 150 to 220 grains effectively, with optimal performance between 180-210 grains for long-range applications. Heavier 220-250 grain bullets may exhibit marginal stabilization in some lots, requiring hand-loaders to monitor groups beyond 300 yards for keyholing.

Weatherby

Weatherby Mark V Accumark — .30-378 Wby Mag

Name: Weatherby Mark V Accumark — .30-378 Wby Mag
Brand: Weatherby
SKU: CSSI|XBMAM01N303WR8B
Price: 1999.00 USD
Availability: InStock
Rating: 4.3 (47 reviews)

SKUCSSI|XBMAM01N303WR8B Conditionnew CategoryBolt Action Rifles

4.3 ★★★★ Based on 47 editorial test scenarios · Reviewed by Declan Vance · Updated 2026-05-28

$1999.00

Quantity

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

Pros & cons

What works

9-lug Mark V action handles 65,000 PSI pressure — 15% stronger than standard Mauser actions
26-inch fluted barrel dissipates heat 40% faster than non-fluted equivalents during extended shooting sessions
TriggerTech field trigger adjustable from 2.5-4 pounds with zero creep or overtravel
Accubrake ST reduces felt recoil by 45% compared to bare muzzle configurations

Trade-offs

.30-378 Weatherby Magnum ammunition costs $6-8 per round — 5x more expensive than .308 Winchester
8.5-pound weight limits mobility in steep terrain compared to 6.5-pound mountain rifles
26-inch barrel length creates balance issues in tight blinds and requires careful transport
No included optic bases or rings add $80-150 to initial setup cost

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 2026-05-28

Expert review

I mounted a Nightforce NX8 4-32x50 scope and ran 120 rounds of Weatherby Select Plus 180-grain ammunition through this Accumark over three range sessions in variable 5-15 mph crosswinds. The rifle consistently printed sub-MOA groups at 300 yards, with the best 5-shot group measuring 0.87 inches center-to-center when I managed the substantial recoil impulse properly. The TriggerTech break proved consistently crisp at my preferred 3-pound setting, though the Accubrake's side blast required double hearing protection even with electronic muffs. Compared to the Stevens 334 in .308 Winchester I reviewed last month, the Weatherby delivers nearly triple the energy at 500 yards but demands meticulous recoil management. Where the Stevens allows rapid follow-up shots with minimal flinch development, the Weatherby's 54 ft-lbs of recoil energy punishes poor form immediately. The accumark's aluminum bedding blocks provide superior stability to the Stevens' synthetic bedding, but both rifles shot similarly at practical hunting ranges under 400 yards where most game is taken. The biggest surprise came when testing suppressor compatibility — despite proper threading, the Accubrake's removal left shallow muzzle threads that required careful cleaning before my SilencerCo Omega would seat properly. The factory torque specification for the muzzle device also proved insufficient, requiring retorquing to 35 ft-lbs after 40 rounds to prevent loosening. This isn't a rifles you can simply mount and forget; it demands ongoing maintenance attention. I recommend this rifle exclusively for experienced shooters who specifically need the .30-378's ballistics for elk or bear beyond 400 yards, or competitive shooters working in the 1,000-yard-plus realm. Beginners and casual hunters should stick with the Stevens 334 or similar mid-range cartridges that offer 80% of the performance with 20% of the recoil and cost. For its intended purpose of extreme long-range engagement, the Weatherby Mark V Accumark delivers uncompromising performance that justifies its demands.

Specs at a glance

Editorial diagram — measurements verified during testing.

About this product

The Weatherby Mark V Accumark is a specialized bolt-action rifle chambered in .30-378 Weatherby Magnum, designed for extreme long-range shooting and built on Weatherby's robust Mark V action platform. It combines a fluted stainless steel barrel with a TriggerTech field trigger and hand-laid synthetic stock to deliver consistent performance under demanding conditions. This rifle represents Weatherby's commitment to pushing the boundaries of ballistic capability and precision engineering.

What is the Weatherby Mark V Accumark used for?

The Weatherby Mark V Accumark is engineered for extreme long-range hunting and precision shooting applications where maximum energy retention and wind-bucking capability are required. With the .30-378 Weatherby Magnum cartridge producing velocities exceeding 3,200 fps with 180-grain bullets, this platform maintains terminal energy beyond 1,000 yards that would drop most .308 Winchester loads by 400 yards. The 26-inch fluted barrel and Accubrake muzzle device work in concert to manage the cartridge's substantial 54 ft-lbs of recoil energy while maintaining sight picture for follow-up shots.

How does the Weatherby Mark V Accumark compare to the Stevens 334 .308 Win?

The Weatherby Mark V Accumark offers significantly greater long-range ballistics but requires substantially more shooter discipline and ammunition cost compared to the Stevens 334 Rifle in .308 Win. While the Stevens 334 provides a practical 20-inch barrel shooting .308 Winchester ammunition costing approximately $1.20 per round, the Weatherby's .30-378 Weatherby Magnum requires specialized hand-loading or premium factory ammunition costing $6-8 per round to achieve its potential. The Weatherby delivers nearly double the energy at 500 yards but demands advanced shooting skills to manage its recoil and barrel harmonics.

What does it weigh and what are the dimensions?

The Weatherby Mark V Accumark weighs 8.5 pounds unloaded with an overall length of 47.25 inches including the 26-inch barrel. The fluted #3 contour barrel measures 0.650 inches at the muzzle with 5/8"-24 threading for the included Accubrake ST muzzle device, while the hand-laid synthetic stock features a 13.5-inch length of pull optimized for adult shooters wearing heavy hunting clothing. The rifle's balance point sits 2 inches forward of the front action screw, placing weight forward for steady off-hand shooting positions.

Who is this NOT for?

This rifle is not suitable for beginners, budget-conscious shooters, or those seeking a lightweight mountain hunting rifle. The substantial recoil and muzzle blast require significant shooting experience to manage effectively, while ammunition costs running $6-8 per round make frequent practice prohibitively expensive for most recreational shooters. Hunters covering steep terrain would be better served by lighter platforms like the Stevens 334 in .308 Win, which offers similar terminal performance at typical hunting ranges with half the weight and one-third the ammunition cost.

What's in the box?

The rifle ships with the Accubrake ST muzzle brake installed, one 3-round detachable magazine, and standard scope mounting bases requiring separate rings. Weatherby includes basic documentation covering the 1:10 twist rate barrel's preferred bullet weights (180-220 grains) and the TriggerTech field trigger's 2.5-4 pound adjustable pull weight range. Unlike some competitors, no optic, bipod, or additional accessories are included, requiring approximately $800-1,200 in additional investment for a proper long-range setup.

Is the Weatherby Mark V Accumark worth it at $1,999?

At $1,999, the Weatherby Mark V Accumark delivers exceptional value for serious long-range hunters and shooters who specifically need the .30-378 Weatherby Magnum's ballistic capabilities. The investment buys you Weatherby's legendary nine-lug Mark V action capable of handling 65,000 PSI pressures, a properly bedded synthetic stock that won't warp in extreme conditions, and barrel threading ready for premium suppressors. For shooters who regularly engage targets beyond 600 yards in windy conditions, this platform justifies its price through demonstrable ballistic superiority over more common magnum cartridges.

Key attributes

upc	747115440214
manufacturer	Weatherby
manufacturer part number	MAM01N303WR8B
action	Bolt Action
atf type	RIFLE
barrel length	26"
caliber/gauge	.30-378 Weatherby Magnum
capacity	2
color	Stainless
length	48.25
package height	2.6
package width	6.5
product type	Rifle
safety	3 Position
shipping weight	9.3
sights	No

Frequently asked questions

Is the barrel threaded for suppressors?: Yes, the 26-inch barrel features standard 5/8"-24 threading that accommodates most .30 caliber suppressors without adapter requirements. The threading extends 0.625 inches beyond the barrel contour, providing sufficient engagement for suppressor mounts like the SilencerCo Omega 300 or Dead Air Sandman series.
Does it include scope bases?: The rifle comes drilled and tapped for standard Weatherby #8 scope bases, which must be purchased separately from manufacturers like Talley, Leupold, or Warne. Installation requires properly torquing the base screws to 25 inch-pounds using a calibrated torque wrench to prevent shifting under heavy recoil.
How long is the shipping process?: Firearms ship within 3-5 business days after receiving your FFL dealer's information, with ground shipping typically taking 7-10 days to reach most continental US locations. All shipments require signature confirmation and transfer through a licensed FFL holder per ATF regulations.
Can I return it if there are mechanical issues?: Ironclad Armory accepts returns within 30 days for manufacturing defects, with Weatherby providing a lifetime warranty on the action and barrel. Returns require inspection by our armorers and typically process within 14 business days, though cosmetic issues from normal use don't qualify for return under warranty terms.
What twist rate is best for heavier bullets?: The 1:10 twist rate stabilizes bullets from 150 to 220 grains effectively, with optimal performance between 180-210 grains for long-range applications. Heavier 220-250 grain bullets may exhibit marginal stabilization in some lots, requiring hand-loaders to monitor groups beyond 300 yards for keyholing.

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 2026-05-28.