MY 2 cents worth,,,,,
The bullets mentioned are great, but designed for the 308 so look at the twists recommended, as well as the velocities.
(Bergers usually require a faster twist)

I found three powders to work well with flat nosed as well as with 125 and 150 gr pointed bullets, and those are
RL 7
IMR 8208
LeverEvolution
Lever gave me the highest velocities
Phone calls can help.
Oh and yes used in 14" contender...