I could be wrong, but I'll go out on a limb and guess it won't get any more velocity than with RL17. Not in this casing. H1000 might come close, but I'm guessing not. In my experience with the 25-06, I got about 200 fps more velocity (3400) with RL17 with about 90% capacity vs Retumbo (3200) at close to 100%, pushing 115 gr bullets.
In any case, no one can complain about either the velocity or accuracy so far.
Now that I've typed out my prediction for all the world to see, probably a good chance I'll be wrong