Many years ago when I had my first 7MM a friend of mine's dad reloaded for me and he used IMR 4831, 67gr with CCI large rifle magnum primers. Of course we had not chrono back then, I know my ruger liked this combo, the bullet I was using was a 162 BTSP hornady. Very accurate. That is for what its worth.
I see in all the reloading books that they say max is below that.
Chuck in Boise