SIG built this in 2022 for the military's Next Generation Squad Weapon program and it is genuinely unlike almost anything else on the shelf. It uses a hybrid case with a steel base to contain pressures far beyond normal cartridges and deliver rifle performance the old .277 world could never reach. Bleeding-edge hardware crossing over into the civilian market. The future arriving early.
Loads run 135 to 150 grain in the modest offerings that exist. A cutting-edge round priced well above the mainstream in small boxes. Being new and unusual it stocks thin so the early adopters buy whenever it surfaces.
