There always the option of 338-375 Ruger or Demon is what we call it. Redding has dies, ptg has reamer, resizing brass is easy and with the right combo you can get a 250 gr bullet up to 3150 fps.
I've posted this before. Out of my 26" Brux and 69grs of Re#19 I'm getting 3500 FPS with a 139gr sst out of a 7mm WSM. 65.5grs of Re#22 produces 3150 162gr A-Max.
I don't know if you've made a decision or not by now, but here is an article on the ins and outs of the 7LRM compared to other cartridges. Check it out! Gunwerks - Gunwerks 7LRM (7mm Long Range Magnum)