The new Sig 277 Fury

[243winxb]

what is the cost of these cases vs conventional one-piece brass?

As the materals used moves away from brass, it should be cheaper. This would be using steel & aluminum types. In the lower PSI ranges.

The higher pressure loadings will use more expensive metals like titanium alloys, or other blends. The head & body can be made from different alloys, because of the mating process used. The patent claims pressure as high as 120,000 PSI. Time will tell.

conventional one-piece brass

Has changed to a newer process years ago. The 2 piece "brass"unit has a stamped case head and extruded body. There are different methods of combining the 2 in the patent. I would guess high pressure swaging forms the completed units.

Brass is still also made by drawing the brass from a cup, as far as i know.

Reading both patents gives a lot of info on the 2 newer "case" forming methods.

 

[243winxb]

 

[Gtscotty]

Dredging this old thread up to update with a link to the newly accepted SAAMI standard cartridge/chamber drawing for the 277 Sig Fury.

https://saami.org/wp-content/uploads/2020/11/277-Sig-Public-Introduction-Orig-2020-11-11.pdf

Hopefully this means we'll soon get some more info on this round, factory rifles, and (fingers crossed) components and load data.

 

[troy fairweather]

Interesting they went with a 1-7 twist but used a 135, so maybe planing for heavier bullets. Looks like 270win fps but in a 16" barrel. 135gr at 3000-16" barrel. Need this in a light rifle and make it a 7mms lol. Would be interesting to see a list of actions the deem safe for the 80,000 psi

 

[LoonWulf]

Interesting they went with a 1-7 twist but used a 135, so maybe planing for heavier bullets. Looks like 270win fps but in a 16" barrel. 135gr at 3000-16" barrel. Need this in a light rifle and make it a 7mms lol. Would be interesting to see a list of actions the deem safe for the 80,000 psi

I thought it was mostly the case failing that was an issue with pressures over 70k.....at least in modern full size rifles.

 

[troy fairweather]

I thought it was mostly the case failing that was an issue with pressures over 70k.....at least in modern full size rifles.

Ya I would think any action made in this century should hold 100,000 psi. I like the idea of shooting normal psi rounds but be able to use the new sig case. Throat erosion maybe a problem, but that new unicorn metal bartlin has may extend that. Could make the 308 more in doing the sky treatment.

 

[LoonWulf]

yeah, if you can bottle up that kina oomph and still get ....I dunno at least mediocre barrel life, it might be worth the extra cost involved. Id expect those pressures to FRY standard barrels in sort order.

 

[Jim Watson]

Interesting they went with a 1-7 twist but used a 135, so maybe planing for heavier bullets.

Speculation
Being originally designed as a military machine gun round, they probably want to provide for a tracer, which is a longer bullet.
Q.V. M16. You don't need a 7" twist for a 62 gr bullet, but you do for the tracer.

 

[troy fairweather]

Speculation
Being originally designed as a military machine gun round, they probably want to provide for a tracer, which is a longer bullet.
Q.V. M16. You don't need a 7" twist for a 62 gr bullet, but you do for the tracer.

I believe your correct, could have some other special bullets planed as well. I just wish it was a 7mm lol, I can deal with .007 smaller bullets.

 

[LoonWulf]

I believe your correct, could have some other special bullets planed as well. I just wish it was a 7mm lol, I can deal with .007 smaller bullets.

nope, can't, deal-breaker.......

 

[Demi-human]

Since this is SAAMI accepted, I do hear by call “dibs” on the brand new wildcat, made of necking up the Fury, to a civilized and proper diameter projectile.
The 7mm Flotsolov Magnum!
What?
It doesn’t roll off the tongue? Well, Fury is pretty neat, but I don’t like to go around mad, maybe the 7mm Angel. That would fit with a Cross rifle.
Ooh, yeah. The Seven Angel. I like it already.

 

[H&Hhunter]

I believe your correct, could have some other special bullets planed as well. I just wish it was a 7mm lol, I can deal with .007 smaller bullets.

My god! Everyone knows that it should have been a 6.5mm, how uncivilized!

 

[troy fairweather]

My god! Everyone knows that it should have been a 6.5mm, how uncivilized!

With 80k psi the bullet will be 6.5 when it comes out the barrel lol. But seriously 6.5 or 7mms make more sense, seems a lot of time spent on making 270 that already exist. Maybe a jack O'Connor fan boy is in charge.

 

[Gtscotty]

My god! Everyone knows that it should have been a 6.5mm, how uncivilized!

Sig stated early on that a 6.5 version of the Fury case, and long action versions were in the pipeline.

With 80k psi the bullet will be 6.5 when it comes out the barrel lol. But seriously 6.5 or 7mms make more sense, seems a lot of time spent on making 270 that already exist. Maybe a jack O'Connor fan boy is in charge.

The Army dictated the caliber, this is just a spin-off of the military development to the civilian market. The 277 Fury is already so similar to what you'd look for in a new high pressure, fast twist short action 7mm, I can't see them muddying the waters with a nearly identical cartridge using a .007" wider bullet. The better 7mm bullet selection would be nice for reloaders, but given where this cartridge came from and why it's coming to market, I'd be surprised if we ever see a 7mm version put out by Sig (I'm sure the wildcat will be developed on day one of case availability though).

I'm really interested to see what the load data looks like. The case is 0.010" longer than .308, but seems to be blown out a bit, still, not much room for a bunch of powder in there unless it's quite dense. I'm a bit skeptical that heavy VLD type bullets are going to be much of an option in short actions given how long the case is and how much powder I think you'll need to pack in (can't have a long, deep seated bullet stealing precious powder capacity).

 

[H&Hhunter]

Sig stated early on that a 6.5 version of the Fury case, and long action versions were in the pipeline.



The Army dictated the caliber, this is just a spin-off of the military development to the civilian market. The 277 Fury is already so similar to what you'd look for in a new high pressure, fast twist short action 7mm, I can't see them muddying the waters with a nearly identical cartridge using a .007" wider bullet. The better 7mm bullet selection would be nice for reloaders, but given where this cartridge came from and why it's coming to market, I'd be surprised if we ever see a 7mm version put out by Sig (I'm sure the wildcat will be developed on day one of case availability though).

I'm really interested to see what the load data looks like. The case is 0.010" longer than .308, but seems to be blown out a bit, still, not much room for a bunch of powder in there unless it's quite dense. I'm a bit skeptical that heavy VLD type bullets are going to be much of an option in short actions given how long the case is and how much powder I think you'll need to pack in (can't have a long, deep seated bullet stealing precious powder capacity).

I saw that and am waiting for the “other” iterations before I go into want mode.

 

[Jim Watson]

seems a lot of time spent on making 270 that already exist. Maybe a jack O'Connor fan boy is in charge.

There was a probably apocryphal legend back in the 6.8 SPC days that while the conservative ballisticians were debating 6.5 vs 7mm, the officer in charge was a staunch Jack O'Connor man and decreed that the number should be 6.8.

I don't worry about VLDs encroaching on powder space. If they can sell the idea to target shooters, they will just put them on long actions.

 

[Gtscotty]

There was a probably apocryphal legend back in the 6.8 SPC days that while the conservative ballisticians were debating 6.5 vs 7mm, the officer in charge was a staunch Jack O'Connor man and decreed that the number should be 6.8.

I don't worry about VLDs encroaching on powder space. If they can sell the idea to target shooters, they will just put them on long actions.

Probably, but then what's the point? There are plenty of long action cartridges that will give the same performance, and even other short action cartridges with magnum case heads. This cartridge's main schtick for the commercial market, as far as I can tell is that it is a short action standard case head cartridge that gives .270 velocity in a light, 16" rifle. The fast twist is nice, but if you are stuck with only lighter bullets in the intended package, it's not really value added.

I'll be interested to see what the load data looks like, but IMO, the 6.8 Western seems like a better design in most aspects and makes more sense for hunters wanting more umph than standard short action cartridges can supply. If you're building anyway, the magnum case head requirement shouldn't be a barrier at all.

 

[sixgunner455]

I am pleased with the developments going on. That doesn’t mean that I particularly want one thing or another, just that this is healthy for the industry and very pleasing to see.

plus, developments in 6.8/.277 bullets are all to the good for people who already own compatible caliber rifles.

 

[BreechFace]

Yea, figured... my 700 in 6.8 I can load to shoot into .13 at a hundred, after that it slows dramatically and yawns. Trying to decide the easiest way to optimize the rifle / dump the 6.8 for something else... any ideas anyone?

PM’d you