Quick update. The 8.5 twist Rock at 5200 foot altitude didn't seem to have trouble stabilizing the 195s at all. Velocity in a 7mm RM with 25" barrel ranged from 2800 to 2890 going up from 66 grains of Retumbo to 69 grains.
Did not see pressure signs but thinking 69 has to be getting pretty close to max. Will work on seating depth a bit to see if I can tighten groups up a bit more but happy to see the velocity where it was.
