Reloading the 277 Fury 6.8x51 SIG Hybrid Case

GFMThunter said:
I'm interested to see what people are doing with this. I've been doing it for a couple years, had some issues with the 308, so just bought a barrel and chambered it to the 277 fury and shoot those. Varget works pretty well. Anyone with more experience, please keep it coming.
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What issues did you have with 308?
 
I was splitting cases lengthwise at super low pressures occasionally. I'd load up fairly high pressure, for a traditional 308 case anyway, then I got a split case. I dropped down a grain and everything seemed fine, then 1 day I got another one. I dropped down again and was at the bottom end of published load data and had it happen with multiple cases. I tried researching and it seemed like it could be a clambering issues or several other things. I just ended up rebarreling to a 277 fury because it would solve 2 of the possible issues. Been good to go since.
 
GFMThunter said:
I was splitting cases lengthwise at super low pressures occasionally. I'd load up fairly high pressure, for a traditional 308 case anyway, then I got a split case. I dropped down a grain and everything seemed fine, then 1 day I got another one. I dropped down again and was at the bottom end of published load data and had it happen with multiple cases. I tried researching and it seemed like it could be a clambering issues or several other things. I just ended up rebarreling to a 277 fury because it would solve 2 of the possible issues. Been good to go since.
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What rifle did you put the new barrel on? Which barrel did you get?
 
deerhunter628 said:
What rifle did you put the new barrel on? Which barrel did you get?
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I am using a Sig Cross, Straight Jacket
walk2112 said:
Any feedback from testing/shooting this 7-08? I’m planning something really similar, just with 150 ELDx and 162 eldm, curious if you’ve found a powder you like?
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I know you weren't asking me, but I'd think the same thing they are using with the 7mm SAW. It's pretty much the same thing, except they use SRP brass to push beyond normal limits of brass vs specialized brass. Who knows what the actual psi for the SAW is, but it's probably right around 70k. If West Texas Ordnance started using the Sig or Alpha Munitions brass, they'd really be seeing some good stuff. The tough part is the experimental part without know the actual psi, it can obviously be very dangerous. I wish there was some published data from Hodgdon and others for the fury, it's been out 3 years now hasn't it?
 
walk2112 said:
Any feedback from testing/shooting this 7-08? I’m planning something really similar, just with 150 ELDx and 162 eldm, curious if you’ve found a powder you like?
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Ruger American Go Wild 22” with brake removed.
Went from 43gr to 47.5gr 2000-MR in 0.5gr increments with the 150TTSX. Barnes max load is 45.2gr. Started around 2550 fps, ended around 2850. Didn’t get any noticeable pressure signs, just figured that was far enough for my comfort. One of the charges toward the top, maybe 46, had a velocity drop. The others were pretty consistent increase. All 10 stayed within about 2moa.
 
Im loving this hybrid brass. Im getting the book velocity of a 24” barrel out of my 18” barrel. How many firings are you guys getting out of this brass?
 
I personally have only fired them once, I bought 1000, so I'm still rolling through them. I know a couple people who have fired 4 and 5 times and have read of a guy on longrange hunting that has loaded them quite a few more than 5, but don't know him personally. No issues so far minus whatever crazy thing I had going with the last clambering when I was resizing and shooting them out of a 308.
 
We did our best to work up and use GRT compared to true velocities for pressure the best we could, but we were getting just over 2900 fps with a badlands bd2 140 grain and 16" barrel. I was getting 3000 with the 150 grain sig box ammo with the same 16" barrel. I think others have resized to 6.5 but I can't remember what speeds and bullets they were getting. I'll see if I can find what it was.
 
I got up to 2975 fps out of my 6.5 cm 143 ELDX but my groups have not been great at the higher pressure. It has been fun playing with but for now im going back to my regular load for the 6.5 cm. I am still playing with the hybrid cases in my 308.
 
deerhunter628 said:
I got up to 2975 fps out of my 6.5 cm 143 ELDX but my groups have not been great at the higher pressure. It has been fun playing with but for now im going back to my regular load for the 6.5 cm. I am still playing with the hybrid cases in my 308.
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Could you define how big/small those groups are on average?
 
What velocities did you start seeing group size open up? Accuracy has always been my concern with the Fury and Backcountry
 
Thats hard for me to say looking back at my photos. The bigger groups may have opened up from barrel heat. I worked up the load shooting 3 shot groups, and looking back they all look pretty good
 
de8a10b19e60d1eb91891cf8e2593f56.jpg



On the left is my 243 hybrid data shooting 108s with a 22” barrel. No issues at all with any sort of pressure so could’ve probably kept going.

On the right is my 20” 308 shooting 178s. I cut this off after my 4th shot because of the pressure signs.

The best accuracy load I found with the 308 hybrid case was with 135TTSX but I’m not all that interested in shooting them.


All just for play, I’ve now turned them into 6.5creed and may just let them sit on the shelf until I pitch them.


Sent from my iPhone using Tapatalk
 
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