Was trying to do some research on this Sig offering it appears to be built of the 308 case with its 80k psi rating can we see a high pressure 260 or perhaps a 7-08 that can push the 7mm heavys let me know what you guys have heard or know or think about this
.277 SigFury wildcatters dream????
- Thread starter Hammer101st
- Start date
Dusty Stevens
Shiner
Hows the bullet selection?
DirtySteve
Gold $$ Contributor
And there went that idea...
Adam in WI
Practically lives here
I think he's asking if you can neck up or improve the hybrid case to take advantage of the higher pressure limit
Thats exactly what i was thinking. A person could use faster burning powders and not be pinned down to the slower burning stuff that wont have enough case fill
46and2
Silver $$ Contributor
A few things I've thought about;
Can a given action safely handle 80k psi?
Can I get decent barrel life from 80k psi?
Can the case actually be sized correctly?
As far as bullets for the 277, Berger makes a 170gr Elite Hunter.
Dont know cant find anything on the sig action that is being used but from what i read it looks like the steel case head takes the brunt of the pressure's still doin research.
As far as the barrel i assume it cant be anyworse than any other fast round Sig did develop this for the military and i dont think they would adopt somthin that would chew through a barrel after 1000 rounds unless they have some kind of voodoo metal or coating up ther sleeve
46and2
Silver $$ Contributor
Well, I've read it was developed for belt fed machine guns... probably chrome lined barrels.
Chrome lineing would defiently help but thats if how they are making the barrels last you can kiss accuracy goodbye my service rifle was garbage it wouldnt hold a group for nothin i hit what i was shootin at but thats all thats needed in the military
Just watched a video on youtube that they are chambering it in the sig crossbolt so i guess its for bolt guns to
Yes Sir !! Barrel life would kill the project in my mind.
Maybe try that tougher barrel steel Bartlein was offering.
I have been testing it and here are some thoughts:
It shows none of the normal pressure signs.
You HAVE to have a pressure measuring system.
The stainless head is very hard to resize.
Barrel life is very short without chrome or melonite.
Many bullets can not handle that much pressure and deform giving poor accuracy.
The speed reached with the hybrid case at its high pressure is the same as can be reached with a larger case at less pressure. Example 6.8 Fury = 270 WSM.
It shows none of the normal pressure signs.
You HAVE to have a pressure measuring system.
The stainless head is very hard to resize.
Barrel life is very short without chrome or melonite.
Many bullets can not handle that much pressure and deform giving poor accuracy.
The speed reached with the hybrid case at its high pressure is the same as can be reached with a larger case at less pressure. Example 6.8 Fury = 270 WSM.
But is any added cost for the harder barrel worth the added rounds over a traditional barrel?
IE. If you barrel is done at say 1,200 rounds, and the harder barrel gives 10% added life, is it worth the additional cost for 120 rounds?
As far as the action handling it. I would say, yes.
When Lazzeroni was doing testing with a large shank Savage action, it took 120,000 psi to permanently deform the chamber. But the action still functioned.
IE. If you barrel is done at say 1,200 rounds, and the harder barrel gives 10% added life, is it worth the additional cost for 120 rounds?
As far as the action handling it. I would say, yes.
When Lazzeroni was doing testing with a large shank Savage action, it took 120,000 psi to permanently deform the chamber. But the action still functioned.
butchlambert
Site $$ Sponsor
You need to listen to Walt. He has been in on this from the Get Go. He has actual experience with this round and rifle. He didn't learn about it on the inner neck.
Any testing with copper mono's ?? No bullet deformation,
and a light, high BC profile, and a speed that my lab Radar
can't read !! LOL Speaking of speed ?? I would think copper
fouling would be a concern.
This all reminds me of the Army's (back in the day) 30/378
5000 fps special purpose round. Fun cartridge to look up.
I did a ladder test in 6.5mm with 121gr solids. I need to do more testing with it. Velocity was 3500ish.
CJ6
Silver $$ Contributor
The factory rounds come in 2 separate "style" cases. 1 comes in an all BRASS case the other is the HYBRID case. I don't believe the all BRASS case (my opinion) will stand up to 80,000psi. It would be nice to know if it does though.
How about some of the better "Smiths" chiming in as to whether a Rem ,Savage etc. will stand up to long term 80,000 psi loads.
How about some of the better "Smiths" chiming in as to whether a Rem ,Savage etc. will stand up to long term 80,000 psi loads.
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The brass case is loaded to standard brass case pressure.
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