As far as I know, it's not yet in production. Nor are there in "off the shelf" rifles made for this round. One can take a .300 ultra win mag round and make the "squatty body." A rifle can be made from any good .308 (any others?).
At least this is what my favorite gun supplier did. Don't know what was used in the load, but he chronographed at 200 yards. <1" groups; 3450fps. I was impressed at what I saw.
Al.