The 6.5–300 is a 300 WBY case necked down from 30 caliber to 6.5mm. The result was the fastest 6.5mm cartridge on the market pushing a 140 gr bullet over 3400
Introduction to the 6.5-300 Weatherby Magnum
What is the 6.5 by 300 Weatherby Magnum?
If you’re a fan of fast, flat-shooting rounds, then you’re in for a treat. The 6.5-300 Weatherby Magnum is a high-velocity rifle cartridge designed for those who demand extreme performance from their ammunition. Simply put, this is Weatherby’s answer to “How fast can we push a 6.5mm bullet?”
History and Origin
Introduced by Weatherby in 2016, the 6.5-300 was born from necking down the massive .300 Weatherby Magnum case to accept a 6.5mm projectile. The result? A cartridge that quickly made headlines for being the fastest commercial 6.5mm round on the market.
Design and Specifications
Cartridge Dimensions
The 6.5-300 Weatherby Magnum is a belted, bottleneck cartridge. Its overall length is about 3.6 inches, and it requires a magnum-length action to accommodate its size.
Bullet Types and Weights
Most factory loads come in bullet weights ranging from 127 to 140 grains. These include high ballistic coefficient (BC) projectiles like the Barnes LRX, Nosler AccuBond, and Hornady ELD-X.
Case Design and Pressure Ratings
With a case capacity exceeding 100 grains of powder, it’s built for speed. It operates at pressures up to 65,000 psi, which contributes to its blistering velocities.
Ballistics and Performance
Muzzle Velocity and Energy
Expect muzzle velocities between 3,350 and 3,600 fps depending on the load. With that kind of speed, energy levels can surpass 3,000 ft-lbs at the muzzle — serious stopping power.
Trajectory and Accuracy
Thanks to its high BC bullets and scorching velocity, it shoots incredibly flat. At 500 yards, you’ll see minimal drop compared to most competitors, making wind calls easier too.
Long-Range Capabilities
This is where the 6.5-300 shines. It was practically built for long-range, offering supersonic flight beyond 1,400 yards with certain loads.
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6.5-300 Weatherby Magnum vs. Other 6.5 Calibers
Compared to 6.5 Creedmoor
The 6.5 Creedmoor is a smooth shooter but nowhere near the same league in velocity or energy. The Creedmoor is efficient and mild, while the 6.5-300 is aggressive and demanding.
Compared to .264 Winchester Magnum
The .264 Win Mag is closer in performance, but the 6.5-300 still outruns it by a few hundred fps and provides a flatter trajectory.
Compared to 6.5 PRC
The 6.5 PRC is a solid middle ground between the Creedmoor and the 6.5-300. But if you want the flattest shooting 6.5mm, the Weatherby still takes the crown.
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Best Uses and Applications
Big Game Hunting
This round was built to take on elk, moose, and even African plains game. With its high velocity and energy, it’s perfect for ethical long-range kills.
Precision Shooting
If you’re into ringing steel at 1,000+ yards, the 6.5-300 will deliver — just bring your A-game (and maybe some extra cleaning supplies).
Long-Range Target Shooting
Its flat trajectory and excellent BCs make it a dream for long-range target shooting, especially in less windy conditions.
Pros and Cons
Advantages
- Fastest 6.5mm factory round
- Flat shooting
- High BC bullets
- Excellent for large game and long-range
Drawbacks
- Barrel life is limited due to high pressures
- Expensive ammo
- Recoil can be sharp
- Not widely available outside Weatherby
Best Rifles Chambered in 6.5-300 Weatherby Magnum
Weatherby Mark V
The Mark V Accumark and Vanguard lines are the gold standard. Built to handle the round’s pressure and recoil, they come with sub-MOA guarantees.
Custom Builds
Want something tailored? Custom rifle builders often chamber this round in long-action, heavy-barrel setups for precision use.
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Ammunition Options
Factory Loads
Weatherby offers several factory loads tailored for different uses, from the 127gr LRX for hunting to the 140gr Match bullets for precision.
Handloading and Reloading Tips
Reloaders love the 6.5-300 for its tunability. Just beware — it eats powder like a truck eats gas. Start with H1000 or Retumbo and work your way up.
Recoil and Barrel Life
Recoil Management
Not brutal, but definitely stout. Consider a muzzle brake or suppressor to tame the beast.
Impact on Barrel Longevity
Barrels wear out fast — 700 to 1,200 rounds is common before groups open up. Use it wisely and clean often.
Optics and Accessories
Scope Recommendations
Think high magnification and quality glass — Nightforce, Leupold, and Vortex are popular. You’ll need clear sight past 1,000 yards.
Bipods and Rests
Stability is key. Invest in a solid bipod like the Atlas or Harris for better precision in the field.
Maintenance and Care
Cleaning Tips
Clean after every use. This round fouls barrels quickly, and precision degrades fast if you don’t stay on top of maintenance.
Storage Advice
Store in a dry, cool place — and keep ammo in sealed boxes to maintain consistency and shelf life.
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Price and Availability
Cost of Ammunition
Expensive. Expect to pay $90–$130 per box of 20. Handloading is a more cost-effective route if you shoot frequently.
Rifle and Gear Pricing
Weatherby rifles aren’t cheap either — a Mark V could set you back $1,800 to $2,500+ depending on the model.
Who Should Use the 6.5-300 Weatherby Magnum?
Ideal User Profiles
This isn’t a beginner’s cartridge. It’s best for experienced hunters, long-range enthusiasts, or reloaders looking for top-tier velocity and reach.
Common Myths and Misconceptions
Overhyped or Worth It?
Some call it overkill, but if you need long-range punch and precision, it’s more than justified.
Barrel Burnout Concerns
Yes, it eats barrels — but with modern materials and cautious firing, you’ll get plenty of life from it.
Conclusion
The 6.5-300 Weatherby Magnum isn’t for everyone — but if you’re chasing flat trajectories, explosive terminal performance, and long-range domination, this round delivers in spades. It’s not the most practical or budget-friendly option out there, but it is one of the most thrilling. If you’re ready for the recoil, barrel upkeep, and price tag, the 6.5-300 could be your next obsession.
FAQs
Q1: Is the 6.5-300 Weatherby Magnum good for elk hunting?
Absolutely. With high velocity and energy retention, it’s excellent for large game like elk at long distances.
Q2: What’s the effective range of this cartridge?
You can confidently shoot game out to 600–800 yards. For steel targets, it stays supersonic beyond 1,400 yards with the right load.
Q3: Can I use it for long-range competitions?
Yes, though it’s not common due to recoil and barrel wear. Precision shooters love it for certain matches.
Q4: How does it compare in price to other magnums?
It’s on the high end — both ammo and rifles are premium priced.
Q5: What twist rate is best for this caliber?
A 1:8” twist rate is ideal for stabilizing most 6.5mm bullets in the 127–140gr range.