Reloading the 277 Fury 6.8x51 SIG Hybrid Case

You said you had worked with 45-90 to get started, did you ask him about the ring? He gas been loading it for years in a multitude of Calibers. He may have some better long term knowledge. I've only been reliading these about 2 years, but he's been doing it quite a bit longer, I haven't had the chance to look at my chamber to see if it has a ring yet. Just curious what he may have seen...?
I didn't say I worked with 45-90, I said I got much of my information from him. Meaning I read a lot of his posts. I contacted Frank Green and his findings is what I saw in my chamber. It would be interesting to see what 45-90 found. But since I've seen it happen in my chamber I really didn't see the need to contact him.
 
A hint I picked up, the cases with different headstamps weigh different and have different capacities.

Did you happen to document the amount of variance between them? I got 200 of them and they are a good mix of 22, 23, and 24. I was planning on fireforming them all and then doing my sorting by volume, but if you have already done some of that and the difference is less than 3-5%, it may not be worth it at first. If it is more than 5%, then I may pick up a couple hundred more so I can put together 3 groups of 100 cases that are all similar.
 
Did you happen to document the amount of variance between them? I got 200 of them and they are a good mix of 22, 23, and 24. I was planning on fireforming them all and then doing my sorting by volume, but if you have already done some of that and the difference is less than 3-5%, it may not be worth it at first. If it is more than 5%, then I may pick up a couple hundred more so I can put together 3 groups of 100 cases that are all similar.
Just weigh your cases and try it out. Ignore the heavy bolt notes here, I didn't have these sized quite right.
 

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Did you happen to document the amount of variance between them? I got 200 of them and they are a good mix of 22, 23, and 24. I was planning on fireforming them all and then doing my sorting by volume, but if you have already done some of that and the difference is less than 3-5%, it may not be worth it at first. If it is more than 5%, then I may pick up a couple hundred more so I can put together 3 groups of 100 cases that are all similar.
No I didn't measure by volume. I went by weight. I didn't get any 22, but I did get 23 and 24. The biggest difference was the 277 Fury vs the 23/24. And I only loaded the 277 Fury. Lance hipped me to that difference.
 
No I didn't measure by volume. I went by weight. I didn't get any 22, but I did get 23 and 24. The biggest difference was the 277 Fury vs the 23/24. And I only loaded the 277 Fury. Lance hipped me to that difference.

Cool.

I just went through my unopened box of 100 and sorted them.

First thing was that there were 105 cases in the box. My first box had 106 in it. Never going to complain about extras.

All of them were stamped "22", "23" or "24". The majority, about 50%, were 24s, about 30% 23s, and the rest were 22s.

I did a very quick weight check by grabbing 5 random cases of each headstamp and here is what I found.

22 Headstamp (weight in grains)
155.76
155.66
155.80
155.88
155.90

23 Headstamp (weight in grains)
166.28
165.34
167.80
165.92
165.02

24 Headstamp (weight in grains)
167.02
165.84
165.66
165.58
165.88

What this tells me is that there was most likely some kind of change between the 2022 run and the 2023 run, but the 2022 run is pretty consistent.

I will do a volume measurement once I fireform the 100 that I have loaded and use samples of 10 of each so as to get a better statistical sample.
 
Cool.

I just went through my unopened box of 100 and sorted them.

First thing was that there were 105 cases in the box. My first box had 106 in it. Never going to complain about extras.

All of them were stamped "22", "23" or "24". The majority, about 50%, were 24s, about 30% 23s, and the rest were 22s.

I did a very quick weight check by grabbing 5 random cases of each headstamp and here is what I found.

22 Headstamp (weight in grains)
155.76
155.66
155.80
155.88
155.90

23 Headstamp (weight in grains)
166.28
165.34
167.80
165.92
165.02

24 Headstamp (weight in grains)
167.02
165.84
165.66
165.58
165.88

What this tells me is that there was most likely some kind of change between the 2022 run and the 2023 run, but the 2022 run is pretty consistent.

I will do a volume measurement once I fireform the 100 that I have loaded and use samples of 10 of each so as to get a better statistical sample.
I believe those 22 stamps might be the same as the 277 Fury cases as they were in the 155 gr range.
 
Cool.

I just went through my unopened box of 100 and sorted them.

First thing was that there were 105 cases in the box. My first box had 106 in it. Never going to complain about extras.

All of them were stamped "22", "23" or "24". The majority, about 50%, were 24s, about 30% 23s, and the rest were 22s.

I did a very quick weight check by grabbing 5 random cases of each headstamp and here is what I found.

22 Headstamp (weight in grains)
155.76
155.66
155.80
155.88
155.90

23 Headstamp (weight in grains)
166.28
165.34
167.80
165.92
165.02

24 Headstamp (weight in grains)
167.02
165.84
165.66
165.58
165.88

What this tells me is that there was most likely some kind of change between the 2022 run and the 2023 run, but the 2022 run is pretty consistent.

I will do a volume measurement once I fireform the 100 that I have loaded and use samples of 10 of each so as to get a better statistical sample.
thanks for the info.... good stuff
 
Yeah I've messages with 45-90 and he's recommended the Lee lube too, which I've tried. I didn't think it made a big difference, annealing well did. Edit: just tried it again and it actually is way better than lanolin/IPA, just a paint to apply. I only tested up to 4x finings on the cases so far, but mostly I'm at 1x.

I've put 233 rounds of the hybrid cases through my barrel, next time I get the bore scope out I'll look for ringing.
If the .223 rounds are from Shell Tech they are a different construction from the Sig 277 Fury. I had a talk with the owner and he was pretty adamant about it.
 
One benefit of the hybrid cases is they can be very accurate. Here's one of the three shot groups, single digit ES/SD. I do three shot groups and then take the last two rounds out to distance. I know five shot would be better on paper but I get bored. All five are on the chrono, the last two out to 800 at the range. Once I get a load I'll go look for coyotes or badgers. If I can't find any yotes I'll shoot past 1k to test the ballistics app and true loads.
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Just a quick update on this.

I fireformed 50 of these cases in my 7-08AI today. After the first 20 I shot one of my regular brass cased loads. I did it again after round 40 and one last one after round 50.

All of them are identical to other cases that have been fired from this barrel.

I have another 50 to fireform and then I will measure for volumes and start load development.
 
Got out and got the other 50 fireformed, so I did a little volume test. I selected 10 random cases of each of the three headstamps. Weighed them on my Fx120i scale. Filled them with room temperature bottled water and weighed them again. Here are the results.

"22" Headstamp
Average case weight = 155.62 grains
Average weight when filled = 213.28 grains
Case capacity by water volume = 57.66 grains

"23" Headstamp
Average case weight = 165.22 grains
Average weight when filled = 221.98 grains
Case capacity by water volume = 56.76 grains

"24" Headstamp
Average case weight = 167.20 grains
Average weight when filled = 223.82 grains
Case capacity by water volume = 56.62 grains

What I am inferring from this is that the construction of the "22" headstamp differs from the "23" and "24" headstamp. So, if you plan on using a bulkier powder the "22" may be better for you, however it is the least prevelant in the 100 quantity boxes from American Reloading. The 23 and 24 are close enough that it shouldn't matter when loading them.

I plan to segregate the 22s from the rest of the brass and will work up a separate load for them, or just put them aside to sell later or use in a different application.

Oh, and still no indication of a ring. Fired three more of my regular brass cased rounds, one after the first 20 fireforming, one after the 40th, and one at the end.
 
Got out and got the other 50 fireformed, so I did a little volume test. I selected 10 random cases of each of the three headstamps. Weighed them on my Fx120i scale. Filled them with room temperature bottled water and weighed them again. Here are the results.

"22" Headstamp
Average case weight = 155.62 grains
Average weight when filled = 213.28 grains
Case capacity by water volume = 57.66 grains

"23" Headstamp
Average case weight = 165.22 grains
Average weight when filled = 221.98 grains
Case capacity by water volume = 56.76 grains

"24" Headstamp
Average case weight = 167.20 grains
Average weight when filled = 223.82 grains
Case capacity by water volume = 56.62 grains

What I am inferring from this is that the construction of the "22" headstamp differs from the "23" and "24" headstamp. So, if you plan on using a bulkier powder the "22" may be better for you, however it is the least prevelant in the 100 quantity boxes from American Reloading. The 23 and 24 are close enough that it shouldn't matter when loading them.

I plan to segregate the 22s from the rest of the brass and will work up a separate load for them, or just put them aside to sell later or use in a different application.

Oh, and still no indication of a ring. Fired three more of my regular brass cased rounds, one after the first 20 fireforming, one after the 40th, and one at the end.
Do you have any load workup done to 70k-80k psi yet?
 
Do you have any load workup done to 70k-80k psi yet?

Not yet. Just got done fireforming. I was planning on using GRT to help guide me as I really don't want to go above 75K, but the 7-08AI is not in their cartridge database and all I can find is reamer prints so I need a couple more measuring tools so that I can measure my Lapua fired cases in order to build the cartridge in GRT.
I also have a trip to our HQ scheduled for 3 weeks from now and we have digital scanners, so I may just wait until then, send a case down ahead of time, scan it while I am there and have our engineering team create a drawing for me.
 
Not yet. Just got done fireforming. I was planning on using GRT to help guide me as I really don't want to go above 75K, but the 7-08AI is not in their cartridge database and all I can find is reamer prints so I need a couple more measuring tools so that I can measure my Lapua fired cases in order to build the cartridge in GRT.
I also have a trip to our HQ scheduled for 3 weeks from now and we have digital scanners, so I may just wait until then, send a case down ahead of time, scan it while I am there and have our engineering team create a drawing for me.
I didn't know you had access to a lab. That would be best. Everything else is just a WAG.
 
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