I'd say it meters similar to H1000.
I messed around with it in my 300 Win. 230 OTMs. Tested H1000 the same day. It takes more grains of N568 to get the same velocity as H1000. I don't think I could get any more powder (N568) in the case and no pressure signs. Pretty compressed loads.
Hype was that N568 was a short cut N570 but from everything I'm seeing and reading, N570 produces higher velocities.
Both powders seemed to have an accuracy node at the same FPS. More testing is needed but I'm currently leaning toward running with the N568.
No input on dirty burning or not.