Interesting and good to know. Do/did you back off the charges a little?Naw, running those bullets is no different than a 308 bullet in a 299 or 298 bore, running high speed. In subsonic mode is where it gets interesting.
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Interesting and good to know. Do/did you back off the charges a little?Naw, running those bullets is no different than a 308 bullet in a 299 or 298 bore, running high speed. In subsonic mode is where it gets interesting.
Yep, military 6.8X 51 is the head stamp on the case ...civilians have the 277 Fury in 2 varieties, all brass and hybrid SS heads ...not likely that you'll whittle some out on the lathe.
But you can buy them, not always readily available, like most everything else. But they can be formed to 308, 6.5 CM, 358 win, as I have, or any 308 based cartridge, 277 length or shorter. They appear like these with the marked ladder load for the case. Yep some 308 loads contain 55 grs of powder, they have more capacity than brass cases. Live and learn...the cartridge world is changing. Better powder blends are needed to make these really go like the 277 powder used in military cases. The military is running machineguns with these 80,000 psi loads.
The 6.5 CM will run 140s at 3156 fps 24" barrel and the 308 will run 200 SMK 715 BC to 2952 fps. And 168s to 3256 fps.in long barrels, and 4000 ft-lb of energy out of a 308 case.
So who needs the big old full brass style magnums? Big magnums could be much smaller in size and be more powerful, in hybrid form.
Similar performance less powder and brass...if all this moves forward. Or dies on the vine... but the 277 hybrid case and 80,000 psi is the real deal.
These cases will take more than 80,000 psi with ease... so be careful with any endevor you pursue, in the hybrid case arena.
For educational purposes only, enter at your own risk.
Definitely not a place for morons, and nothing can beat the Hornady’s "New" lines of ARC. & PRCs ..it says do on the box, and in their advertising, & ballistics hype talks, propaganda, & charts...but none of its new or improved...but the hybrid case and 80,000 psi IS...
Yes 5%, then just worked up as normal. The 123gr ak47 copper flashed steel core rounds shot great, in a 308, as did the same type of heavy 54R projos in a 300wm. The 123's in a 300wm loaded to afterburner, are worth having around.Interesting and good to know. Do/did you back off the charges a little?
It defeats Russian body armor...you can buy the civilian version, semi auto, for a mere $8000 or $9000, Plus $3 per shot ... if it were available...but I'm not sure what varieties the public gets. A person has fired the ammo in his 277 Fury and it was 150 faster than printed on the box from a 16" barrel.I fully understand progress, and why the military is wanting more reach. Not being up for a knife fight or lacking the skill sets to work closer, yes more reach would be comforting.
I do not run a suppressor, but you can buy the civilian version of this rife, in semi auto with a suppressor installed...the only way it comes. Very expensive and so is the factory ammo.Have you shot enough of these to see the effect on barrel and bolt life? Sounds good but does it turn a 308 into a 243 or 22250 concerning barrel life
Also do you shoot suppressed?
Russian body armor does not concern me, one bit. Those who made/make it an issue, concern me though.It defeats Russian body armor...
I do not run a suppressor, but you can buy the civilian version of this rife, in semi auto with a suppressor installed...the only way it comes. Very expensive and so is the factory ammo.
They also have a special bore treatment, Sig says is good for 12,000 rds ...(sounds like Hornady) they have to meet set military standards for accuracy, and velocity, same as any military round...It's a military weapon. So one day it will be as cheap as 5.56 or 7.62...only better.
It was me, and the cases can be made in 308 easily...and 6.5 CM, and 358 Win as I have done...other calibers too.I got to find the post, but if I understood it correctly, someone was using 277 fury cases, with the stainless case head, and getting high velocity with 30 cal bullets in the modified cases. (Maybe it was @45-90 ?)
Not exactly a 308.
But maybe those cases can be made for 308 so that 70,000 psi or higher is ok?
Got to find that post…
This.Additionally pressures are not linear. It’s not a nice smooth line. It’s relatively linear until it’s not and then it’s a “exponential increase”.
And once you increase enough “thinking you know the visual signs”, you might have lug setback of a few thousandths. That then snowballs to more pressure issues.
Does the force which really breaks barrels or is it dangerous?
Yep...kinda, sorta, ..in a way... but almost not really...but my 300 WM has to be faster than my 308..Wait so there’s actually people who don’t start their testing at max and push 3-4gr above? Weird.
Haven't ever tried any of those Palma bullets. Recently @GBMaryland was kind enough to give me some 160gr Warner Flat lines to try.The international Palma shooters have long built 308 Winchester rifles to push a 155-grain Sierra boat-tail match bullet fairly fast out of a longer 28 to 30-inch barrel. Typically that's out of a specialized single-shot action (Stolle Panda, Stiller, Barnard, Nesika, RPA, Paramount, etc.).
Start with a long-throated tight-bore .298" barrel finished at 30-inches. Long-load a Sierra 155 Palma bullet (or perhaps a 155 Lapua Scenar) over 46 grains Varget. That bullet will go close to 2900 feet per second. Don't know the pressure numbers but that's with conventional brass (not hybrid) cases.
What kind of accuracy did you see with the 30.Haven't ever tried any of those Palma bullets. Recently @GBMaryland was kind enough to give me some 160gr Warner Flat lines to try.
First outing with them I was pretty impressed. Warner's load data listed about 30 powders & CFE223 was near the top for speed. Oddly Lever was not on the list, so of course that's what I used. CFE & Lever are pretty damn close with the edge going to Lever with regards to speed & forgiveness at the upper end.
Anyway I ran 3 loads in some Virgin primed MAI (Norma) 308 LR brass. Neck mandrel &od/id chamfer was only prep.
26" Osprey 10 twist 308 Win PVA barrel.
160 Flat Line loaded 2.954" = .018 off lands. G7/.278 G1/.556
Primer ?
Lever
47.4 = 3002 SD(P) 5.8
47.8 = 3024 SD 10.4
48.2 = 3055 SD 15.1 Primer flat, but no cratering, no hard bolt lift. SD headed up. Pockets tight.
None of the above are compressed loads 48.2 is close.
I'm happy with 3000
What I've noticed with Lever in 308 is that when you find it's happy place the burn signature is super clean.
Below pic of 47.4 Lever 160 FL load.
View attachment 8329615
The 3 on the right are the 47.4 Lever (pretty much zero carbon), compared to the 3 on the left 45.4gr RL 15.5 with 177 smk @2760.
View attachment 8329616
Edit: Here is a snip-it of Warner load data for a 26" barrel with the 160's
Notice I'm loading .100 longer. The Norma case capacity is on the smaller end of the spectrum for 308 though.
View attachment 8329617
I was just looking for pressure/speed, but all were under 1”.What kind of accuracy did you see with the 30.
Couldnt get them to shoot that well
Would not stay below .7 or so at 100
The smaller stuff shot much better /groups