Ramshot Magnum produces the highest velocities in all of my over-bore cartridges. It's about as slow as RL25. My 270 WSM hits 3155 fps with a sub-max load of Magnum and 150 gr AB's. Small high pressure signs. That's the fastest that I've got these bullets going. It's only a little temp sensitive. Not nearly as bad as RL22.
The cartridges that like Hunter seems to be less overbore like the 300 WSM
My 25 WSSM liked it.
If you like RL22 and hate the temperature problems, try Accurate Magpro.
Same burning speed as RL22. Nearly the same velocities as Magnum with less charge weight and good temp stability.