I have several posts in two different threads on the 6.5mm CM.
Lots of data on the bullets and powders used.

https://www.savageshooters.com/showt...-5mm-Creedmoor
https://www.savageshooters.com/showt...highlight=Oryx

Hope these help. The first thread was when I started shooting my 12 FV and the second was after I replaced the factory stock with an Oryx chassis.
I have three 6.5mm CMs - 12 LRP, 12 FV, and 10T-SR.
The two Model 12s like heavier bullets up to 147 ELD-Ms which by the way perform slightly better than the 143 ELD-Xs in two of the rifles.
The 10T liked lighter bullets in the 123 to 130 range.
Both shoot 140 gr bullets well.

Over time, I have found that H4350 performs best, with IMR4451 second, and IMr4350 third. RL-17 performs best with lighter bullets but is a distant fourth.