The CIP is supposed to be looking at 277 sometime soon. If it gets CIP approval that will hopefully mean PPU, S&B and maybe one of the Russian companies will start making ammo. If nothing else it will hopefully lead to some standard pressure tested loading data.
MDWS was working with Cor-Bon at one point to get the cartridge before SAAMI. I don't know what has become of that effort.
Sent from my SM-G930P using Tapatalk