Re: 7mm rem mag powders
I love my Alliant powders, and RL-22 has given great results in my 7mm with the 168 Berger. As Joe said, temp stablity is more of an issue with them though, but it is something i will live with for now.
I know many, many guys that swear by H-1000, as well as one of my most trusted reloading friends that can give another vote for Retumbo.
Honestly i think it is mostly what your rifle likes most out of them, i don't think there is one that is really "bad" or "best" for your application either. Each have their own set of perameters that can help you narrow it down, but the rifle is the final judge.