A .284 from .277 Sig Fury?

[Fire Dog]

Has anyone started to neck up the .277 Fury to .284?
Looks to be a winner but waiting for Sig to get around to offering their own version may be a long wait.
Faster than a 284 SAUM, .284 Win or Shehane with less powder {hopefully longer barrel life and less recoil too!}
Only Sig is making a rifle with action components that will handle the reported 80K pressure but a re-barrel with a 7mm barrel of 28"-30" has me thinking of a new F Open winner.
The Sig rifle is well under $2K so it is a "doable" project without taking a second mortgage on the house...
Had a 7mm Rem Mag 1,000 yd rifle about 38 years ago but found it hard to find places to shoot that discipline around S Cal in those days {Ah, sweet bird of youth, where have you flown...?}
Also that big case of powder knocked the starch out of a shoulder after about 25-35 rnds!
Any opinions/suggestions from those who have played around with building an exotic would be appreciated.
Cheers,
Fire Dog
BTW: I currently shoot F Open with a 6BR and holding well {put down a 118.8 out of a possible 120.20 at 700 yds last week} (English scoring system in OZ) until 800 & +, then it gets lots harder...

 

[Titan]

Has anyone started to neck up the .277 Fury to .284?
Looks to be a winner but waiting for Sig to get around to offering their own version may be a long wait.
Faster than a 284 SAUM, .284 Win or Shehane with less powder {hopefully longer barrel life and less recoil too!}
Only Sig is making a rifle with action components that will handle the reported 80K pressure but a re-barrel with a 7mm barrel of 28"-30" has me thinking of a new F Open winner.
The Sig rifle is well under $2K so it is a "doable" project without taking a second mortgage on the house...
Had a 7mm Rem Mag 1,000 yd rifle about 38 years ago but found it hard to find places to shoot that discipline around S Cal in those days {Ah, sweet bird of youth, where have you flown...?}
Also that big case of powder knocked the starch out of a shoulder after about 25-35 rnds!
Any opinions/suggestions from those who have played around with building an exotic would be appreciated.
Cheers,
Fire Dog
BTW: I currently shoot F Open with a 6BR and holding well {put down a 118.8 out of a possible 120.20 at 700 yds last week} (English scoring system in OZ) until 800 & +, then it gets lots harder...

I don't believe there is a source of the bi metal brass/steel case head which you would need for the 80PSI, other than pulling apart sig factory ammunition (4$ a round) unless there is a direct sale option somewhere on their website.

 

[Rtheurer]

It has been resized to 6.5mm i am told. I do not know if its been necked up to 284 yet.

 

[ChrisNZ]

I suspect the suggested wildcat wouldn't be much if any better than the more std chamberings as regards barrel life. Sure, less powder should give lower recoil with lower rocket effect but 80K psi can't be nice on a throat..

 

[Andy Legg]

I don't believe there is a source of the bi metal brass/steel case head which you would need for the 80PSI, other than pulling apart sig factory ammunition (4$ a round) unless there is a direct sale option somewhere on their website.

$52.49/100 Primed New Sig Cases Delivered....shows to have 16,500 in stock.

I like the idea of a 7mm in an ar10….much less than 80k PSI though (maybe 65-68k though).

277 Fury / 6.8x51mm SIG Primed "Hybrid" Case - 100ct

ALL CASES CONTAIN STUCK POWDER Pulled, Primed Brass - Casings may contain minor dents/scratches *All casing should be resized prior to loading

americanreloading.com

 

[CJ6]

Using standard (brass) cases for the conversion it would be nearly identical to the 7-08 Rem.
From what I've been told resizing the base can be difficult with the bi-metal base. Then finding the right powder to get 80kpsi is another matter

 

[Walt Krafft]

BTDT - no gain over a standard 284.

 

[mike mccormick]

^^^^^^^^^^^ if anyone knows, it's Walt