.277 SIG Fury (6.8x51mm) - .270 WCF Performance from a 16" Bbl.

[Garandimal]

The 277 SIG Fury

​

"...Currently, SIG is moving forward with civilian versions of its 6.8mm cartridge developed for the competition, the 277 SIG Fury. This cartridge utilizes a hybrid case technology made from brass and other materials. The combination is rated to handle 80,000 psi of chamber pressure. By comparison, “magnum” cartridges typically produce a maximum of 62,000 psi.


277 SIG Fury Ballistics

This added pressure will drive a 135-grain bullet from SIG’s Hybrid Match cartridge 3,000 fps from a 16-inch barrel, and produce 2,694 ft.-lbs. of energy. The 135-grain bullet has a respectable .488 G1 BC.


SIG’s 277 Fury Hybrid Hunting load features a 140-grain bullet with a .508 G1 BC, launching from a 16-inch barrel at 2,950 fps. That one produces 2,706 ft.-lbs. of muzzle energy, too...."


Factory 24" Bbl'ed .270 WCF performance...




GR

 

[94045]

I'm waiting to see how they tame the recoil.

 

[Jim Watson]

Reality not matching early rumors of .270 Wby speed, but still an overload.
Wonder about reloading dies, methods, and data.

Wonder what the action specs are, materials, lug engagement, lug shear area.
I don't guess we should rechamber our Chile Mausers.

 

[Gtscotty]

The round does equal what a .270 Bee would produce out of a 16" barrel, maybe even a little better.

More info on the first rifle it will be chambered in in this thread:

https://www.thehighroad.org/index.php?threads/sig-cross-rifle.860569/

 

[jmr40]

Looks good on paper, but the recoil and long term durability of rifles subjected to 80,000 psi is a concern. If they can solve those problems it may be a winner.

 

[LNK]

Hope it works out for them, I could use more options for .277 bullets for my 270.

 

[Scooter22]

Phew! Is it for anti personal or game? Does anybody need it? I don't want that type of new pressure jump next to my face. JMO
PS I don't want a 2 piece case with a seam to fail at the head.

 

[Gtscotty]

Phew! Is it for anti personal or game? Does anybody need it? I don't want that type of new pressure jump next to my face. JMO
PS I don't want a 2 piece case with a seam to fail at the head.

Does anyone need most of the cartridges out there? Most are 90% overlap, this one is actually doing something different, giving Magnum performance in standard case sizes with smaller charge loads and lower recoil.

The 80 ksi MAP shouldn't cause you any heartburn, all that matters safety wise is that it is properly contained with a sufficient factor of safety, just like any other cartridge. 65 ksi isn't going to be very kind to your face either, but every manufacturer that puts out a .270 Win makes sure that their design can contain the pressure safely. There's no big engineering hurdle between containing 65 ksi and 80 ksi, the design just needs to account for the loads.

 

[<*(((><]

Hope it works out for them, I could use more options for .277 bullets for my 270.

I was thinking the same thing but for my 6.8 SPC II

 

[Garandimal]

The round does equal what a .270 Bee would produce out of a 16" barrel, maybe even a little better.

More info on the first rifle it will be chambered in in this thread:

https://www.thehighroad.org/index.php?threads/sig-cross-rifle.860569/

Well, what that tells me is that they put a 1:8.5 Twist rate in the Bbl. - which will really give it some B.C. legs and heavier rounds.

But that would probably need slower powder and conventional length Bbls.

Maybe end up with .280 AI performance from a short action and less recoil.




GR

 

[Swampman]

Are the "hybrid" cases safely reloadable?

 

[ApacheCoTodd]

Yeah.... I'll just go ahead and file that away with the .357 Sig and .45 Gap from the get-go.

Todd.

 

[Jim Watson]

Are the "hybrid" cases safely reloadable?

Nobody says. If not $2+ a pop ammo will put a damper on sales.

What is the head diameter, can we make it out of something CHEAP?
Have to have two sets of data.

 

[Goosey]

Right now it's just a novelty. But if the cases are stronger and can last longer it may gain more traction. It's already used in certain boutique pistol ammo. People these days don't seem too concerned with barrel life (get another) or muzzle blast (wear ear pro). I don't think we will see a wider range of slippery .277 bullets from this, as someone will just neck it to .264 or .284 instead.

 

[Jim Watson]

"Certain boutique pistol ammo" two piece cases call for a $100 specialty die set if you just must reload. At least you can pick them up with a magnet.

 

[Gtscotty]

This article has some good info on the round:

https://www.gunsamerica.com/digest/277-sig-fury-demystified/

It sounds like:

-Reloading components and dies will be available at some point.
-A 6.5mm version and possibly some long action cases are in work. (I'd hope a 7mm version would also be somewhere in the plans, lots of good bullets).
-Barrel life is better than you'd expect, possibly with the help of some coatings/treatments.
-Actions will need to be designed to handle the higher loads from this chambering.

The Sig Cross looks like it's perfectly set up for suppressed hunting, in which case muzzle blast won't be an issue.

 

[Scooter22]

Does anyone need most of the cartridges out there? Most are 90% overlap, this one is actually doing something different, giving Magnum performance in standard case sizes with smaller charge loads and lower recoil.

The 80 ksi MAP shouldn't cause you any heartburn, all that matters safety wise is that it is properly contained with a sufficient factor of safety, just like any other cartridge. 65 ksi isn't going to be very kind to your face either, but every manufacturer that puts out a .270 Win makes sure that their design can contain the pressure safely. There's no big engineering hurdle between containing 65 ksi and 80 ksi, the design just needs to account for the loads.

Well you go get one and test it my friend. Like you said there are plenty out there. I'll stick with the old tested rounds and go up a step if I need a bigger round. But the 2 piece case and pressure turns me off. Good luck and have fun.

 

[Jim Watson]

Better than usual plugfest article.
We now know it has Standard head diameter, making all sorts of risky fun convenient.

 

[Gtscotty]

Well, what that tells me is that they put a 1:8.5 Twist rate in the Bbl. - which will really give it some B.C. legs and heavier rounds.

But that would probably need slower powder and conventional length Bbls.

Maybe end up with .280 AI performance from a short action and less recoil.

GR

Yeah, the 8.5 twist is a good sign, in time, if the concept becomes popular, maybe companies will come out with some heavier .277 bullets.

In the link above, the author mentions that Sig has been working with some new powder blends formulated specifically for this application. I'd bet that when they roll out the reloading components, there will be some accompanying powders as well.

I really like the rifle, and if the reviews are good I'll probably get one. It'll be in 6.5, but given that the barrels and bolts are user swappable, I could see myself trying the new Fury cartridge once reloading supplies are available.

 

[DocRock]

I'm a grumpy hater of all things "new".

And I'm rather intrigued. I like short barrels but not short barrel velocities. So...

 

[Random 8]

Wonder what kind of speeds it will get in a 24-26" barrel? Bet it will eat rifling. Interesting concept, I kind of hope it doesn't grow legs. Sounds like a bad deal for those who like to reload.

 

[Gtscotty]

Wonder what kind of speeds it will get in a 24-26" barrel? Bet it will eat rifling. Interesting concept, I kind of hope it doesn't grow legs. Sounds like a bad deal for those who like to reload.

What makes you say that? Sig said that they intend to bring out reloading components and dies for the .277 Fury. Those who like to reload will be able to reload this cartridge and will probably find the change of pace and new capabilities interesting to explore.

 

[someguy2800]

I am interested in it and its resulting offspring and wildcats as hunting cartridges. Assuming it can be safely reloaded. The only thing I am really reserved about is that I bet the muzzle blast will be tremendous in a 16" barrel. I love the idea of 270 win performance in a 16" barrel though, but if firing it in a hunting situation requires ear protection to avoid permanent hearing damage, that is kind of a non starter for me.

 

[Garandimal]

Right now it's just a novelty. But if the cases are stronger and can last longer it may gain more traction. It's already used in certain boutique pistol ammo. People these days don't seem too concerned with barrel life (get another) or muzzle blast (wear ear pro). I don't think we will see a wider range of slippery .277 bullets from this, as someone will just neck it to .264 or .284 instead.

270 Caliber 170 Grain Extreme Outer Limits (EOL) Elite Hunter




GR

 

[Garandimal]

I am interested in it and its resulting offspring and wildcats as hunting cartridges. Assuming it can be safely reloaded. The only thing I am really reserved about is that I bet the muzzle blast will be tremendous in a 16" barrel. I love the idea of 270 win performance in a 16" barrel though, but if firing it in a hunting situation requires ear protection to avoid permanent hearing damage, that is kind of a non starter for me.

Well...

If the use quicker powder to generate 1/3 higher chamber pressure, for a 1/3 shorter barrel...?

The muzzle pressure might be similar.

Like a HG round out of a carbine.


I think that the milspec calls for a suppressor.