“Unless Manufacturers switch their capacity to 6.8.”
Not easily. Look at that bi-metallic proprietary case. It is a hybrid three-piece cartridge case with a steel case head and brass body connected by a locking washer to support high chamber pressure of 80,000 psi. The casing itself is a three piece assembly.
And little known factoid, steel can even rust. This is gonna be awesome anywhere but the desert. And they rust there too. Gonna be fun to have your ammo start rusting.
You do realize the USSR and China both have used exclusively steel cased small arm’s ammo since the 1940. That includes the entire Vietnamese conflict in rain soaked jungle with 100% humidity 24/7 for months on end. Steel cases are coated with a baked on shellac that is nearly impossible to remove even filing at it with a file won’t get it all off. Steel also takes twice the PSI in this case 80,000 that’s well above the standard 65,000 psi most small arm’s rifles run at. Sig has been making bimetal cases for years. Bimetals are also routinely used for larger rounds including tank and anti aircraft sized rounds ATK makes some.