I say if your happy with 4064 (velocity,accuracy) then I would use it up.
If you ever decide to stretch it out then you might consider something else.
I starred using 4064 in 06 with 165's and was very happy. Then I switched to imr 4350 and was very very very happy.haha
thanks for the advice. I have a 7mm rem mag I am extremely pleased with launching 160 accubonds at 3000fps at .5 verified MOA out to 400 yards now. I can only test to 500 yards but have not yet and the place I hunt right now only has one opportunity to shoot 400 yards anyways. All other opportunities will be under ~250 yards. So basically, if I think I will sit on that 400 yard field I bring my 7mm rem mag which is a "heavy" gun haha not much fun carrying that thing on stalks. if I decided to stalk/hunt the woods where most shots are actually <100 yards but couple spots that are roughly 250 yards that is when I bring my 3006 and I really do not need blazing speeds right now. I called around and cannot locate any IMR4350 anyways. I figure I will use up this 4064 on the current rounds and be satisfied. When I come across imr4350 I will buy a few pounds of that for the future, it seems imr4350 is a diverse powder and I am sure I will use it eventually anyways, whether in the future with this rifle OR if I buy another rifle that can use this powder.