6.8x51 with a bi-metallic case? So it’s a non reloadable case and a first ever case with two separate components.
Expense and complexity for no good reason I can see.
Yup,
Go with what Ya Know.
No. It is closer to the old "Everlasting" rifle brass with a steel head.
It’s 6.8x43mm.
Sigs been making bi metal cartridges for a while now.
You can buy rifle chambered for one now. And for the last few years
Weapons on the battle field never garther brass and reload it. Rounds are a single use item. In training the U.S. MILITARY also doesn’t reload its brass its used once and let go to the used brass market or crushed and sold for scrap. The Chinese and the Russians have always used steel cased berdan primed non reloadable cases because they are half the price of brass and the rounds were and always will be single use items for war or training. Steel will take twice the PSI of brass and is much MUCH cheaper. There is a reason to use steel on the base that’s where peak pressure is and the strength of steel means you can really crank the pressure and there for velocity up. Brass has a single advantage its more malleable and seals the breach face at the neck of a round much better than steel this is why the hybrid design. Steel in the base to crank the pressure up and cut costs ,brass in the head and neck area for proper sealing and reduced blow by. The military could care less about reloading they don’t do it for training rounds and certainly don’t go policing brass off the battlefield. These new rounds should be stone cold man stoppers with effective ranges nearly a mile a 140 gr8 .277 round in a proper fast twist 1:7 rate can be as slick or slicker than any 6.5mm which is only a few hundreds of an inch narrower. These rounds should stay super sonic and stable well past 1200 meters with lasers and wind compensating computers hits on man sized targets at that distance are basically point, range and shoot. This is a quantum leap from the 1960s era 5.56 and iron sights.