New Commercial Calibre - .277 Sig Fury

[Alsone 789]

OK please don't roast me on this, you know how I like to explore new calibres. 

There's a new alternative to the .308 / 6.5 Creedmoor that's coming out soon  (also a 6.5 version coming for those who absolutely must have a 6.5) - the .277 Sig Fury.

Exact figures aren't out there but it delivers a 140 gr bullet at in excess of 3,200 fps. Barrel wear is still being assessed but as it's under consideration for use in the New US military's machine gun (!) you'd have to assume it's reasonable. Only perfomance figures I could find were 6-9 feet less drop at 1,000yds than 6.5 Creedmoor (yep probably no-one exept ELR target shooters care about 1,000 yds, but for us, you take it as flat shooting as that's a massive difference over 6.5Cr). Energy is stated at shot show as 20-25% greater than 6.5 Cr at 1,000yds.

6 month old article here - chose this older one because it explains everything clearly. New cartridge design looks like a game changer for the industry as it allows unprecedented pressures and therefore previously unobtainable performance from potentially any claibre it's chambered to:

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

Edited July 1, 2020 by Alsone

[Sausagedog 7,381]

Oh boy

[Born Hunter 17,784]

It's a contender for the US Armies new rifle round right?

Basically the new 556..... which was the new 762...... which errrrr was the new 30.06......

And out of all those, which would I opt for 

The aught six I reckon! 

[Born Hunter 17,784]

To be fair though, if it finds widespread acceptance in Western militaries then it'll likely takeoff in the sporting sector. All the other major military cartridges have done. Does it offer any significant advantages (to sportsmen) over the current 270 or 7mm-08 . But if it becomes a NATO standard then firearms manufacturers will produce everything in it and it'll just become widely available.

[Alsone 789]

It's already being offered to the civilian sector. No matter whether it's adopted by the military, sig have said they are going to push it out as a civilian calibre alongside a future 6.5 Sig Fury.

I believe the military version isn't designated .277. I thought the military verson was designated 6.8mm but it works out to just over 7mm using conversion apps, so who knows. 

By backworking the figures, against 6.5 Creedmoor, 25% more energy would be: 2853 ft lbs using the figures for 140gr 6.5cr (2,283). That exceeds .30-06 on both velocity and energy in a package offering almost certainly far less recoil. So it blitzes 5.56, 762 and .30-06 by the looks of it. Even 20% is up there with .30-06. So sounds like an interesting new calibre. They are predicting cheap ammo if nato adopted as the ammo will be mass produced. The only thing that may off put some people on here is the one gun chambered in it atm the Sig Cross, is marmite. I like it, but it does look like an AR. Guess designed to appeal to the US market primarily. Has the advantage fo a folding stock though. It's also not too heavy at 6.8 lbs.



 

 

Edited July 1, 2020 by Alsone

[Born Hunter 17,784]

1 minute ago, Alsone said:

It's already being offered to the civilian sector. No matter whether it's adopted by the military, sig have said they are going to push it out as a civilian calibre alongside a future 6.5 Sig Fury.

I believe the military version isn't designated .277. I thought the military verson was designated 6.8mm but it works out to just over 7mm using conversion apps, so who knows. 

By backworking the figures, against 6.5 Creedmoor, 25% more energy would be: 2853 ft lbs using the figures for 140gr 6.5cr (2,283). That exceeds .30-06 on both velocity and energy in a package offering almost certainly far less recoil. So it blitzes 5.56, 762 and .30-06 by the looks of it. Even 20% is up there with .30-06. So sounds like an interesting new calibre. They are predicting cheap ammo if nato adopted as the ammo will be mass produced.

 

Yeah, right'o. 

Maybe it is going to be the best thing ever and we all adopt it. If the yanks don't pull the pin on the comp then I'm sure it'll win simply because the other two offerings look gash and then it'll become the new standard infantry cartridge and it'll take off. If they don't then I don't reckon it'll be setting the world on fire, despite the ballistic claims. Maybe I'm wrong.

[Alsone 789]

Ultimately I don't know. What's more interesting is the cartridge rather than the calibre as the cartridge design opens up the way for much higher pressures in almost any calibre. In some there may be no advantage but in others, it may be possible to squeeze much higher performance whist keeping reasonable recoil. 

[Born Hunter 17,784]

Aye, we'll see. It's in the calibre bracket that'd be useful for me.

 

[Sausagedog 7,381]

There has been steel cased ammunition for decades.

It's just that no one saw the need for any more performance than we already have in the field.

The other issues is the diminishing returns of bullet performance. The more a bullet is pushed the more it fails. The more it fails the more you toughen it up. The more you toughen it up the less it does on target.....

[Born Hunter 17,784]

1 minute ago, Sausagedog said:

There has been steel cased ammunition for decades.

It's just that no one saw the need for any more performance than we already have in the field.

The other issues is the diminishing returns of bullet performance. The more a bullet is pushed the more it fails. The more it fails the more you toughen it up. The more you toughen it up the less it does on target.....

Fair comments. In the case of this cartridges development one of the requirements was superior penetration for body armour as future warfare is expected to be peer on peer conflicts rather than the counter insurgency of the last few decades. Not that I want to alarm anyone, LOL.

[Sausagedog 7,381]

Ammunition producers have traditionally always tried to imply their latest product is the ultimate. They are constantly trying to extract our money by offering the latest ultimate.

They are just like the shampoo makers that perpetually keep making better and better shampoo but when you read the ingredients they are exactly the same as a decade ago!

[Sausagedog 7,381]

2 minutes ago, Born Hunter said:

Fair comments. In the case of this cartridges development one of the requirements was superior penetration for body armour as future warfare is expected to be peer on peer conflicts rather than the counter insurgency of the last few decades. Not that I want to alarm anyone, LOL.

I'm not interested in conflict. It has no bearing to hunting. And I don't watch action movies.

[Born Hunter 17,784]

1 minute ago, Sausagedog said:

I'm not interested in conflict. It has no bearing to hunting. And I don't watch action movies.

My point exactly. 

[Sausagedog 7,381]

The list goes on and on. Reinventing the wheel.

Voere caseless ammo rifle. The 5mm Remington rimfire. The Remington electronic ammunition. Gimmicks to extract cash.

 

[walshie 2,804]

Woe betide the next guy on here who innocently asks if he should buy a 308 or a 6.5.