New 6.5-300 Weatherby Magnum Cartridge

Weatherby 6.5-300

Weatherby announced the introduction of a new cartridge that the company calls the fastest production 6.5 cartridge in the world. The new 6.5-300 Weatherby Magnum has muzzle velocities ranging from 3,395 – 3,531 fps depending on the load.

Weatherby will support the new ammunition with its rifle line including the new Mark V Accumark rifles.

The initial loads will ship in January 2016. Weatherby currently has three loads listed for the new cartridge:

  • 127 grain LRX bullet @ 3,531 fps and 3,516 ft-lbs
  • 130 grain Scirocco bullet @ 3,476 fps and 3,487 ft-lbs
  • 140 grain A-Frame bullet @ 3,395 fps and 3,583 ft-lbs

All three loads have a MSRP of $95 for a box of 20 cartridges.

Richard Johnson

An advocate of gun proliferation zones, Richard is a long time shooter, former cop and internet entrepreneur. Among the many places he calls home is


  • Southpaw89

    That round must have the trajectory of a laser beam, wonder how many shots you get before your barrel melts. Still, would like to see some long range shooting done with this.

    • Tassiebush

      My guess is it’s a barrel life of 600 rounds approx. Hehe I’ll be interested to find out what it’ll actually turn out to be. But like you say it’d definitely be a very flat shooter.

      • flyfishr

        600 rounds = $2850. Plus shipping.

        • wedelj1231

          Still cheaper than the rifle, probably

  • HenryV

    I feel the need; the need for speed. 🙂

  • ostiariusalpha

    I guess if you have enough money to burn that you feel perfectly comfortable buying a Weatherby chambered in any of their other eccentric calibers, the barrel life on this rifle won’t trouble you in the slightest. Wouldn’t mind seeing some more development in the >140gr 6.5 match & long distance hunting projectiles, barrel melting cartridges like this and 26 Nosler (also to a lesser extent the 6.5-284 Norma) could maximize their potential.

    • Phil

      How about the .264 Brooks Guys??? A.K.A. 6.5 x .257 WBY…. Shoots 140 Bergers or 142 Noslers at 3250 FPS. I’ve chambered several for guys and so does McWhorter…. Excellent barrel life, shoots like a laser. You can use any of the Weatherby brass in .257, .277 or 7mm since they are all the same specs, very easy to neck up or down, my preference is to neck the 257 Wby case up with a .22 to .264 taper button in either your neck sizing die or full length die, and yes you can use Redding .257 dies- no need for custom dies unless you really want ’em…. Do some research…. This is a sweeeeet cartridge!

  • USMC03Vet

    Pants on head prices.

    • Anonymoose

      Weatherby prices.

  • iksnilol

    That thing is going to smoke barrels faster than Biggie smoked blunts. O_o

  • dshield55

    So what is this a .300 winmag necked down for 6.5? I love 6.5mm bullets. My first rifle was a 6.5×55 Swedish Mauser and I built out a 6.5 Grendel upper. Depending if Hornady picks this up (to me, it’s not mainstream enough unless they pick it up) I may go 6.5-300 over 6.5 Creedmor on a future build.

  • Nate

    Because .26 Nosler didnt burn barrels fast enough for you: the 6.5-300 Weatherby Magnum

  • Zang Kang King

    Wonder how difficult it is to reform (Neck down, fireform)once fired 300WBY brass. Certainly worth it with the crazy ass brass prices. Looks like a fun hunting cartridge. What ever the barrel life is.

  • Blake

    It’d be interesting to see a ballistics comparison between this & a 180gr Berger 7mm Rem Mag load.

    & then try it with this:

  • Jeff

    On a quiet day you can hear the throat being washed away.

  • smartacus

    **COUGH** 257 Weatherby **COUGH**

  • smartacus

    and they should only be allowed to sell these as a package:
    3 boxes of 20 PLUS a new barrel

  • Vitor Roma

    A heavier load at 2,800fps makes more sense to me.165 grain 6.5 would have some crazy BC.

    • Secundius

      @ Vitor Roma.

      I believe the 147-grain 7.62x55mm/NATO/HSR, is rated in excess of 4,000-ft/sec.

  • flatdick

    My .270 winchester handloads will push a 130 grain bullet at 3200 fps.

  • nobody

    What, no 90 grain loads?

  • Broadkil

    I just do not see a real need for this round.
    I LOVE the 6.5, heck I miss my 6.5×284, but this?
    This I just can not begin to get my head around.
    Wasn’t the 6.5-06 AI enough?
    What about the old 6.5 Remmington Mag?
    Whats next?…the 8x99mm?

    • Secundius

      @ Broadkill.

      Are you Serious or just a typo. I’d like to see the rifle that can handle a 43.7-caliber cartridge???

  • Edeco

    AKA the .262 Cutting Torch

  • Adam

    Just in case you ever wanted to have to change barrel before the magazine.

  • Blake

    If you “need” this level of performance to the degree that you’re willing to go with what is essentially a proprietary rifle & cartridge (unsure if Weatherby has submitted this to SAAMI but given the likelyhood of any non-Weatherby rifles chambered in this, it can be considered proprietary…) , you might as well go full-bananas & get a 7mm Allen Mag:

    338 Lapua Mag necked down to 7mm. Drives a 200gr Allen or 195gr Berger bullet to 3300fps. The bullet is still going 2200+ fps @ 1200yds.

    His numbers for 6.5mm Allen Mag beat the 6.5mm Weatherby’s too, & he’ll form your brass for you for about $1/rnd.

    Or just get one of the many fine .338 Lapua Mag factory rifles available, with factory ammo available at half the price of this Weatherby stuff…

    • iksnilol

      You know the price is bad when .338 Lapua is cheap in comparison.

      • wedelj1231

        Well hell, when you say it like that you just make the 6.5-300 sound stupid!

        • iksnilol


          They’re pretty close though. S&B .338 is 3 USD per round. Hornday Match in .338 Lapua is 4.5 USD.

          • All the Raindrops

            This round is geared towards extreme long range shooters, no doubt. 2000-2500-3000 yards++. 6.5 is on the small side for those fellas. 338LM or 338AX can be reloaded for 1.50 a round, so not that bad actually if you’re just taking 20 or 40 shots at a 2000yard gong.

          • iksnilol

            Can it outrange the .338?

  • DetroitMan

    “All three loads have a MSRP of $95 for a box of 20 cartridges.”

    BWA HA HA HA HA HA HA HA HA HA HA HA HA HA HA *long raggedy breath*

    HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA *long raggedy breath*

    HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA HA *long raggedy breath, wipes tears away from eyes*

    Ok, seriously? Are the cases formed from gold instead of brass? Are the bullets depleted uranium? Is the powder a new formula that makes your muzzle blast a beautiful rainbow? Wildcats are notoriously expensive, but this is over-the-top ridiculous. I’m sure some well healed F Class competitors will step up to see if they can gain an advantage. The rest of us will join betting pools on how long their barrels last.

    I love 6.5 mm cartridges, and I love the idea of a really fast one, but I know when I’m being ripped off.

    • El Duderino

      Three to zero, one to shoot the deer. $95 for 5 years worth of ammo!

  • phil

    Didn’t Wright & Hoyer do this back in the 70s? I am 99% sure a 6.5×300 W-W-H is in my older Sierra loading manuals…

  • dltaylor51

    Lets just go all the way and build a 6.5 50BMG and be done with it.I dont like seeing all of these new rounds that keep coming out because the ammo makers are dropping some very fine tried and true calibers from their lines to make room for the new calibers that keep coming out every year.If you want to wildcat a new round based on an existing caliber go for it but dont buy into these new rounds or you may be sacrificing off a perfectly good older round to get it.The ammo shortages of the Obama years are still very,very fresh in my mind and i shall not soon forget.

  • El Duderino

    Quick change barrel?

  • wedelj1231

    Since no one else will say it, I will. What does his do over the .26 Nosler?

  • OldOldLawyer

    Unless you take the plunge to the Weatherby calibers you can’t really understand their value…………if you never shoot beyond 250 yards you dont need one, so dont waste your money….once you pass 300 yards that extra 200-300 fps make all the difference in the world…I shoot 257 and 300 Weatherby..having moved way up from 243 and 30-06…….it gives you a whole new concept in shooting with a laser like trajectory… far as barrel life, that is all hype….barrels wear out when you shoot them after they get way hot…..only a fool would shoot enough out of my 300 to hurt the barrel… dont shoot prairie dogs with them and they will last a lifetime….duh? Also, the 257 has a kick like a 30-06, manageable for anyone, yet flat to 350 yards….so even if you can’t judge distance, anyone can succeed with one, also, you can make 257 brass by just running new 7mm mag brass thru the die, they are 1/64 short but it makes zero difference in either accuracy or on the chrony…..if you take open country hunting seriously, you really need to step up to Weatherby…..duh?