Low 40 grains has been found to work.
You could load up a couple starting mid to upper 30's and see where it goes. If it were me which it isn't so make your own choice.
I would load 3 at 38gr. And see where its at.
X3 38
X3 38.3
X3 38.6
X3 38.9
X3 40.2
That gets you there quick and solid info to start with