Re: Powders for 7mm Remington Magnum
Well the distance at which you plan on shooting an elk will make a difference on bullet selection.
As to powders, Re25, Re22, are beyond excellent in the 7mag. I have used both with great success and I keep a lot of both on hand. I've also loaded plenty with H1000 and some with Retumbo. In my experience, you won't find better velocities than with the Alliant Reloder powders. I've never worried about the temp sensitivities and they've, knock on wood, never failed me.
If you are looking for a great elk bullet at moderate ranges look no further than a 160 Partition.
If you want a long range high BC bullet, for what it's worth, I'm going to be trying the 168 VLD, 180 VLD, 180 Hybrid VLD (all Berger), and the 180 VLD by JLK bullets.
Also, look at cutting edge, matrix, and wildcat bullets.