I have been working with H1000 primarily in mine. Does very well with both 160's and 175's. Retumbo would work just as well in mine but I didn't really have enough to work with. I get about 3050 from H1000 and 175 PTs, 3200 with 160's. Retumbo seems like it get another 50 FPS on those numbers.
Nice thing with the 7mm MSM is even those bulky powders like H1000 and Retumbo have PLENTY of room in the case to make it work well.
The 150 and 7828 sound pretty good.
140 AB and 65 grains of IMR4350 run 3225 from my fireforming loads. Around MOA. Could easily work with them, but heck, the accuracy on them is plenty for now and the speed is like a 280 Ackley +...
