Reloading the 277 Fury 6.8x51 SIG Hybrid Case

[z987k]

So how much velocity gain would one expect with the same rifle and bullet but standard case vs the hybrid cases? Roughly. If you need a cartridge I’d pick 243, 7mm08 or 308 as those are what I have.

200fps or so.

 

[GFMThunter]

It's tough to say, but I'd say a pretty safe bet is a gain of 150-200 fps without pushing it too hard at least. One reason I say it's tough to say is that I've never done a straight changeover using the same gun and only changing the brass/powder charge. I did get good numbers compared to a regular 308 and what I thought was good for a fury, but I was also running a 16" barrel and comparing it to what most data is posted using 20-24" barrels. So I would assume if you were using the same gun/barrel length and changed to the hybrid brass, you'd have upwards of roughly 300 fps. This is a rough "guesstimates" from some of my data is all... no facts using same barrel length. Crazy to think though, the 150 grain box ammo from Sig was traveling 2995 average +/- 5 fps from my 16" cross fury. What velocity does a 150 grain travel at from a 270 with a 16" barrel??? lol, nowhere near 3000 fps I'm guessing.

 

[z987k]

It's tough to say, but I'd say a pretty safe bet is a gain of 150-200 fps without pushing it too hard at least. One reason I say it's tough to say is that I've never done a straight changeover using the same gun and only changing the brass/powder charge. I did get good numbers compared to a regular 308 and what I thought was good for a fury, but I was also running a 16" barrel and comparing it to what most data is posted using 20-24" barrels. So I would assume if you were using the same gun/barrel length and changed to the hybrid brass, you'd have upwards of roughly 300 fps. This is a rough "guesstimates" from some of my data is all... no facts using same barrel length. Crazy to think though, the 150 grain box ammo from Sig was traveling 2995 average +/- 5 fps from my 16" cross fury. What velocity does a 150 grain travel at from a 270 with a 16" barrel??? lol, nowhere near 3000 fps I'm guessing.

I've ran 338F with factory federal 200gr fusion at about 2590 from 18" barrel and from the same rifle, 338 fed from fury brass with a 200gr hot core at 2785. Using software to estimate pressure and worked up there based on previous results.
Right there with 338-06 and 338 RCM. 50-60fps short of 338wm.

 

[fishdart]

I am less than a tyro with regards to reloading as far as resizing cases. What exactly is required to turn these cases into .308win? All I have are Lee dies with FL resizing die with the center decapper rod down the center.

Looking to cut my barrel from 22" to 18 or 19 for suppressor use and would love to keep similar velocities with the shorter tube.

 

[dkime]

I am less than a tyro with regards to reloading as far as resizing cases. What exactly is required to turn these cases into .308win? All I have are Lee dies with FL resizing die with the center decapper rod down the center.

Looking to cut my barrel from 22" to 18 or 19 for suppressor use and would love to keep similar velocities with the shorter tube.

Just run it through your FL die and voila


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[Ringbill27]

Just run it through your FL die and voila

That’s it? Seems to easy for the steep shoulders on the 277. I’m going to have to try this.

 

[dkime]

6.5 creed development

Obviously we’re kind of drifting into an abyss with this brass and other chamberings so this is strictly information. (That’s my attempt at a disclaimer)

Had some brass that had some wrinkles in it from sizing. Used that brass to run a very rough pressure/velo test. We got a pile of rain so I was only able to get to about 80yds for a range. Wasn’t particularly interested in accuracy but pleased to see a relatively round group.

147Eldm
Staball 6.5
20” Tikka

1: 2665 44gr
2 2707 44.5
3 2748 45
4 2798 45.5
5 2864 46
6 2898 46.5
7 2901 47 (no idea which other hole it went into)

Primers look fine but bolt started getting stiff around 46gr and even with steel heads I was able to get a few swipe marks.

If I revisit this I will probably load around 45.5 and shoot a group. I’m not interested in pushing the gun too much, 147s at 2800 would be more than enough for what the intended use would be. Still attempting to decide if the juice is worth the squeeze in this whole project.

My 243 and this rifle are the only two rifles Ive had what I would consider success with this brass. The 308 displayed some awesome performance but recoil with my bullet selection and the accuracy drifted too much for me to be interested in continuing to mess with it.

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[fishdart]

The 308 displayed some awesome performance but recoil with my bullet selection and the accuracy drifted too much for me to be interested in continuing to mess with it.

Curious what projectile you were using for the .308. light/fast, or heavy for caliber?

Also, it sounds like the Shell-Shock NAS3 .308 win cases should be available soon to play around with.

 

[dkime]

Curious what projectile you were using for the .308. light/fast, or heavy for caliber?

Also, it sounds like the Shell-Shock NAS3 .308 win cases should be available soon to play around with.

178eldm

And 135TTSX

For the first time in my life a Barnes shot better


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[z987k]

That’s it? Seems to easy for the steep shoulders on the 277. I’m going to have to try this.

I'd run a mandrel first, then run it through the 308 win die. Going to 338F I run a 6mm-308 mandrel, then a 308-338 mandrel. Then through a 338F die.

 

[Ringbill27]

6.5 creed development

Obviously we’re kind of drifting into an abyss with this brass and other chamberings so this is strictly information. (That’s my attempt at a disclaimer)

Had some brass that had some wrinkles in it from sizing. Used that brass to run a very rough pressure/velo test. We got a pile of rain so I was only able to get to about 80yds for a range. Wasn’t particularly interested in accuracy but pleased to see a relatively round group.

147Eldm
Staball 6.5
20” Tikka

1: 2665 44gr
2 2707 44.5
3 2748 45
4 2798 45.5
5 2864 46
6 2898 46.5
7 2901 47 (no idea which other hole it went into)

Primers look fine but bolt started getting stiff around 46gr and even with steel heads I was able to get a few swipe marks.

If I revisit this I will probably load around 45.5 and shoot a group. I’m not interested in pushing the gun too much, 147s at 2800 would be more than enough for what the intended use would be. Still attempting to decide if the juice is worth the squeeze in this whole project.

So the creedmore isn’t a cartridge I’ve messed with yet. Are these velocities higher than you’d expect with a full brass case with this amount of powder?

 

[Ringbill27]

I'd run a mandrel first, then run it through the 308 win die. Going to 338F I run a 6mm-308 mandrel, then a 308-338 mandrel. Then through a 338F die.

Wonder if I should try this with the 358win built I’m thinking of. Hmmm.

 

[dkime]

So the creedmore isn’t a cartridge I’ve messed with yet. Are these velocities higher than you’d expect with a full brass case with this amount of powder?

I’m going to switch powders and assuming the accuracy is where I want it to be, I should be able to gain around 150-200fps over what I would be running in commercial soft brass. However I either run Lapua or ADG for full brass cases and the difference between those brands and the steel would probably only be 100fps.


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[dkime]

I’m going to switch powders and assuming the accuracy is where I want it to be, I should be able to gain around 150-200fps over what I would be running in commercial soft brass. However I either run Lapua or ADG for full brass cases and the difference between those brands and the steel would probably only be 100fps.


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Update

Adjusted my seating depth as it turns out I was into lands. Had two pieces of brass that wouldn’t chamber due to a wrinkled shoulder.

Switched to H4350
H4350

2825fps 43.5
2840 44
2865 44.5

Accuracy was greatly improved albeit through small sample size

Will probably run the 43.5 charge as I’m not too greedy on Velo and this equates to what would essentially be 6.5PRC ballistics


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[Ringbill27]

Update

Thanks for the update. Finally got around to looking at numbers on Hodgdons site and comparing them to yours. It’s really impressive. 200fps more or less increases with 4” less barrel compared to the data.

How’s the case fill even at 43.5?

Typically when I play around at the top on the load data charges the case is pretty full. At least in the cartridge I load for.

 

[Ringbill27]

Also, it sounds like the Shell-Shock NAS3 .308 win cases should be available soon to play around with.

So I went to their website and wasn’t quite sure whether these were nickel plated two piece stainless steel cases or are they nickel case with a stainless steel brass?

 

[GFMThunter]

So the creedmore isn’t a cartridge I’ve messed with yet. Are these velocities higher than you’d expect with a full brass case with this amount of powder?

For reference, my 20" 6.5 PRC shoots the box ammo of Hornady Hunter 143 grain at 2833 fps for reference.

 

[dkime]

Thanks for the update. Finally got around to looking at numbers on Hodgdons site and comparing them to yours. It’s really impressive. 200fps more or less increases with 4” less barrel compared to the data.

How’s the case fill even at 43.5?

Typically when I play around at the top on the load data charges the case is pretty full. At least in the cartridge I load for.

It’s definitely filling up, it’s probably going to end up right at compressed by the time I tweak seating depth with the 147. I may also drop back to the 140s, we’ve killed enough elk with them in the last few years to hardly justify the 147


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[Ringbill27]

For reference, my 20" 6.5 PRC shoots the box ammo of Hornady Hunter 143 grain at 2833 fps for reference.

Very helpful thank you

 

[dkime]

Moved onto the 243

108s 22” barrel

43gr h4350 3084 average

Worked up from 42, accuracy didn’t really change much but this gun just seems to shoot everything well.


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