Reloading the 277 Fury 6.8x51 SIG Hybrid Case

[khuber84]

I noticed a sharp edge there at the steel brass junction. The steel must be thinner there also so it makes me wonder if that sharp edge flex outward and act like a knife cutting into the chamber.

Almost like a belt line is what I was told. I would guess it's due to dissimilar expansions causing a pinch there possibly.

 

[xsn10s]

Almost like a belt line is what I was told. I would guess it's due to dissimilar expansions causing a pinch there possibly.

Could be. But I believe the steel is a smaller diameter than the brass. And I don't see the steel expanding except MAYBE the thin part where it meets the brass. But that's just a wild guess on my part. All I can say is yes it's like a belt line and starts out very faint. And grows more defined with each firing. And then at the top of the belt line a very sharp line forms. I can catch my finger with that line. I stopped using them at that point.

 

[walk2112]

Could be. But I believe the steel is a smaller diameter than the brass. And I don't see the steel expanding except MAYBE the thin part where it meets the brass. But that's just a wild guess on my part. All I can say is yes it's like a belt line and starts out very faint. And grows more defined with each firing. And then at the top of the belt line a very sharp line forms. I can catch my finger with that line. I stopped using them at that point.

Good info. You remember about how long it took for the marring to show up? As in how many rounds on a one chamber?

 

[xsn10s]

Good info. You remember about how long it took for the marring to show up? As in how many rounds on a one chamber?

It was my 260 AI and I have a total of 12X rounds fired including fire forming and load development. It was forty cases total so I'd say I noticed a faint band around the 2nd to 3rd cycle of firing. Early on my fourth cycle of firing is when I could catch my finger in the defined thin line on the top of the "band". That is when I stopped using them. So 120-130 maybe total? My barrel is a stainless Rock Creek barrel which is very accurate. Frank messaged me back and forth and I asked about using chromoly barrels, nitrided barrels, and chrome lined. He didn't like chrome lined barrels due to possible accuracy issues. The other combinations helped delay the issue but it's still going to happen.

 

[xsn10s]

Let me also say others plan to use the hybrid cases on older barrels to test if their chambers get marred too. Or so they said in LRH forums. So that's something to consider. I really had high hopes for these cases. I still have them on the shelf.

 

[walk2112]

Dang, I’ve been wanting to shoot the crap out of them in my 7-08 but should have figured there’s no free lunch. I was thinking it would take more rounds than that to cause any issues. Thanks for info.
Not really interested in marring the chamber of my stainless featherweight barrel, maybe I’ll just try 10-20 for science in that barrel

 

[xsn10s]

Dang, I’ve been wanting to shoot the crap out of them in my 7-08 but should have figured there’s no free lunch. I was thinking it would take more rounds than that to cause any issues. Thanks for info.
Not really interested in marring the chamber of my stainless featherweight barrel, maybe I’ll just try 10-20 for science in that barrel

That was my plan too. Run them in my Howa Superlite 7-08 and my Rem PSS 308. I shelved them to see if Sig or someone comes up with a solution. I estimate I have well over 10k rounds through my PSS since 1991. But my family bought that rifle for me when I returned from the Army so it has great sentimental value. It has great possibilities. We'll have to see what the future brings.