IMR 7828 has consistently been the best in my 7mm RM's
Also really good but now unobtainable is RL25 and Ramshot Magnum. I've never had much luck with H4831SC or H1000, but I may have given up too early on those due to success with 7828
I have used, with good success IMR and H 4350 with 140gr and 150gr bullets.
I have also switched over to Rem 9 1/2 primers (from Federal 215M) and am very pleased with the results.