In my 6.5-284's I primarily use H-4350 with 130's every once in awhile, but primarily 140's. I do use Hybrid 100V in one of my 6.5-284's
In my 6.5-06 I run 140's and I have used H4831sc, but currently use Hybrid 100V.
To take advantage of the case capacity of a 6.5-06 Improved I would typically use the heavier bullets for the caliber.
130's through 150's (If you have the right twist)