Weatherby Mark V Accumark .257 Wby Mag 26″ Barrel
Pros & cons
What works
- AccuBrake ST reduces felt recoil by approximately 45%, making high-pressure .257 Wby Mag loads manageable for extended range sessions.
- Pre-bedded aluminum chassis system in the stock provides a consistent sub-0.5 MOA foundation with quality factory ammunition.
- Adjustable TriggerTech Field trigger breaks cleanly at a user-set weight between 2.5 and 5 pounds, eliminating factory trigger creep.
Trade-offs
- Ammunition cost is prohibitive for high-volume practice; factory loads average $4.50-$5.75 per round, nearly 3x the cost of .308 Winchester.
- 26-inch barrel length increases overall length to 48.25 inches, making it cumbersome for maneuverability in dense woods or tight vehicles.
- NFA-regulated accessory compatibility is limited; the 5/8×24 threads are standard, but the cartridge's extreme pressure disqualifies many suppressors.
Video review
Expert review
Specs at a glance
About this product
The Weatherby Mark V Accumark .257 Wby Mag 26″ Barrel is a specialized bolt-action rifle engineered for high-velocity flat-shooting applications where precision matters beyond 400 yards. It combines Weatherby's overbore .257 Weatherby Magnum cartridge with a rigid 26-inch fluted barrel and a purpose-built synthetic stock, creating a platform that sacrifices some practicality for ballistic superiority. The Mark V action and adjustable TriggerTech trigger provide the mechanical foundation needed to exploit that performance.
What is the Weatherby Mark V Accumark used for?
This rifle is designed for specialized long-range hunting of medium-sized game like antelope, mule deer, and varmints in open terrain. The .257 Weatherby Magnum cartridge pushes 100-grain bullets to muzzle velocities of 3,600+ fps, drastically reducing holdover and wind drift at distance. The Accubrake ST muzzle brake manages the significant recoil of these high-pressure loads, though it increases report, making it a poor choice for anyone prioritizing stealth or hunting in densely wooded areas. The 1:10″ twist barrel is optimized for premium hunting bullets in the 100-120 grain range.
How does the Weatherby Mark V Accumark compare to the Stevens 334 .243 Win?
The Mark V Accumark is a superior choice for hunters demanding extreme flat trajectories and retained energy past 300 yards, while the Stevens 334 in .243 Win is better for general-purpose use and cost-conscious shooters. The .257 Weatherby Magnum delivers approximately 800 ft/lbs more muzzle energy than the .243 Winchester, extending ethical shot range by 75-100 yards on game like pronghorn. However, this comes at a real cost: the Accumark is priced at over $2,000 compared to the sub-$500 Stevens 334, and its specialized ammunition costs nearly $5 per round versus $1.50 for common .243 Win loads.
What does it weigh and what are the dimensions?
The rifle has an overall length of 48.25 inches and a bare weight of 8.3 pounds (3.76 kg). The 26-inch barrel is fluted in a #3 contour, reducing weight by approximately 6-8 ounces compared to a non-fluted barrel of the same length and profile. Once you add a quality scope, rings, and a bipod like a Harris S-BRM, the total system weight will exceed 10.5 pounds, which is a crucial consideration for any hunter covering significant ground on foot, as opposed to more compact options like the Stevens 334 with its 20-inch barrel.
Who is this NOT for?
This rifle is not for budget-minded shooters, those hunting in thick timber, or anyone sensitive to recoil and muzzle blast. The combination of the powerful cartridge and the aggressive Accubrake ST creates a punishing concussive blast for the shooter and anyone nearby. I would not recommend this for a new shooter, as the cost of ammunition for practice is prohibitive, nor for a hunter whose average shot is under 150 yards, where its ballistic advantages are irrelevant. It is also not a suitable suppressor host due to the high gas volume and pressure.
What's in the box?
You receive the barreled action with the Accubrake ST muzzle brake installed, the detached fiberglass stock, and the necessary hardware for assembly. Weatherby includes documentation on the proprietary Mark V action and the nine locking lugs, along with a thread protector for the 5/8×24 muzzle threads if you choose to remove the brake. Note that no optics, rings, or bipod are included; a proper optic for this rifle’s capability, like a 4-16x50mm scope, will often cost nearly as much as the rifle itself.
Is the Weatherby Mark V Accumark worth it at $2003.99?
The Accumark is worth its price for a specific shooter: the experienced hunter who regularly engages targets beyond 350 yards and requires a dedicated, ultra-flat-shooting tool where misses are measured in inches, not feet. You are paying for the proprietary cartridge performance, the refined Mark V action known for its strength and 54-degree bolt lift, and the stiff bedding system. If your hunting situations do not demand that level of specialized long-range ballistics, a more conventional cartridge in a less expensive platform will serve you better and save you over $1,500.
Key attributes
| upc | 747115440160 |
| manufacturer | Weatherby |
| manufacturer part number | MAM01N257WR8B |
| action | Bolt Action |
| atf type | RIFLE |
| barrel length | 26" |
| caliber/gauge | .257 Weatherby Magnum |
| capacity | 3 + 1 |
| color | Stainless |
| length | 48.25 |
| package height | 2.75 |
| package width | 6.0 |
| product type | Rifle |
| safety | 3 Position |
| shipping weight | 9.97 |
| sights | No |
Frequently asked questions
- Is the barrel threaded for a suppressor?
- Yes, the barrel is threaded 5/8×24 at the muzzle. However, the .257 Weatherby Magnum generates extremely high pressure and gas volume, and not all suppressor manufacturers rate their products for this cartridge. You must verify compatibility with the suppressor manufacturer, such as SilencerCo or Dead Air, before use, as using an under-rated can will void the warranty.
- Does the 26-inch barrel make it too long for a hunting rifle?
- It depends on your mode of transport and terrain. At 48.25 inches overall, this rifle is approximately 6 inches longer than a typical 20-inch barreled rifle. In a vehicle or ground blind, the length is manageable. For climbing into a tree stand or navigating thick brush, it can be unwieldy. Measure your case or scabbard; you'll need one at least 49 inches long for safe transport.
- What is the best ammunition for this rifle?
- Weatherby Precision Plus ammunition loaded with 100-grain Barnes TTSX bullets or 115-grain Nosler Partition bullets is factory-optimized for performance. For reloaders, Norma brass, Reloder 25 powder, and the 110-grain AccuBond are a proven combination. Due to the tight chamber tolerances, always use Weatherby-headstamped brass to avoid dangerous pressure issues.
- How long does shipping take for an online-only firearm?
- After purchase, allow 2-3 business days for Ironclad Armory to process the order and prepare the firearm for transfer. It is then shipped via next-day air to your selected FFL dealer, per federal regulations. The total time from order to your dealer receiving it is typically 5-7 business days, plus any time required for your dealer to log it in and notify you for pickup and the mandatory NICS background check.