I don't shoot that caliber but I have used the Hodgdon Hybrid 100V in another caliber and liked it real real well. It is a good powder for several of the magnum calibers.
IMR 7828 would be a good choice and you can always find it even when there ain't much around! RL 26 may be good also but I've never tried it and has been hard to find most the time.
I have shot tons of IMR 4064 in the 7mag also with very good results...
I use RL26 and 215M with 180's in my 7mm Blaser Mag which is a near twin to the 7mm Rem Mag. In a 26in tube I get 3050fps with Berger 180's. H4831 is another excellent powder but I get nearly 100fps more with RL26.
Ok, none of my manuals nor the alliant website show load data for reloader26 and 175 gr pill.
Anyone have any info? I already know, start low and work up. Just looking for book low/high data for reference.