There's a bunch of reading material on here from the last 5 months, quite a few have tried it.
As for me I bought one of the first Stoner barrels and mine is accurate with 50 gr zmax, which is what I wanted to shoot. I get 3420 fps from the 18" barrel with 30.4 gr 8208. Seating depth was the key.
Nosler brass with the rebated rim shows swipes with higher end loads. Some are using Hdy 6mm Hagar brass which uses a 6.8 rim and it should take some higher pressures and hold together better. Not a lot of love here for it, but mine isn't going anywhere and it might be my fur gun this year. Even with a suppressor it fits in my RZR and should be a hammer.
That's it in a nutshell.