This is intended for people interested in the subject of military guns and their ammunition, with emphasis on automatic weapons.
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I read someone (not a SIG employee) who claimed SIG was getting their weight reduction by comparing performance. A conventional brass cartridge would weigh x to achieve the performance specifications; our cartridge achieved the performance specifications at 20% less weight than x. Sounds plausible, anyway.
I agree with Farmplinker. I think that the 20% reduction that SIG talks about is vs a comparable cartridge like the 270 WSM. One article I saw said that the existing round is about the same weight as 7.62x51.
smg762 said...Also whats the energies of the 277 tvcs...is it about 2000ft lbs like the 7mm-08?
No, considerably more. We have seen numbers of 3000fps with a 135 grain bullet, so closer to 2700ft-lbs, which makes it more like a 270 WSM. The goal is to penetrate hard body armor at several hundred meters, 600 iirc. It is to have a suppressor. As near as I can tell, other goals included less recoil than a .22 rimfire, lighter weight than the average feather, and the abilities to tie the soldiers boots and walk the General's dog.
USMC is already transitioning to widespread use of suppressors, so it's not surprising that Army could follow suit.
SIG's base is Stainless Steel, then the body of the case is brass.
I should know better than to rely on my memory these days...
I remember thinking that Emeric's neckless polymer case from a decade or so ago was the way to go and seeing it realised I still think that. Enough in common with existing designs to not frighten the conservatives (like me) and a significant improvement in performance.
Great find Stan.
So that seems to confirm that the TV 6.8 can be pretty easily adapted to existing 7.62 weapons.
That is can be adapted to the lightweight, Constant Recoil KAC AMG is especially promising.
Assuming weapon and cartridge perform as good as they look, that would be a hell of a combination.
Well its confirmed.
SIG's "20% lighter" is lawyering the contract; 23% lighter then .270 WSM brass...
If that's actually compliant to the RFP, it's only because the RFP was shockingly badly written. It should never have been defined as "20% lighter" unless there was an actual baseline cartridge to compare against that was actually in service use, like 7.62x51.