I have only used IMR powder in this one and 65 grns isn't max. despite any book. Work your way up and you'll see it's OK.

If this is youir first one then as you work on loads remember that the object of the game is not speed like a bolt gun. It's a decent speed that keeps the LH on the LH and the RH on the RH and small groups.
If the tubes cross, LH printing on the RH and vice versa then it's too fast.