For powders, try H-1000, Retumbo, IMr 7977, 8133, The also mentioned IMR 7828, RL 22, 23, 25, 26.

Swift lists IMR 1350, 4831 and 78298 all getting real close or just 2900

RL19, 23, 25 get 2900-almost 3000

H1000, 4350, 4831 run 2885, 2814, 2892

All are max loads.

My own loads I did well with h1000 and retumbo with the 150. Trying 8133 tomorrow as my retumbo is gone and h1000 is low.

I have print outs of lots of other older load data for the 7RM too if you dont get somewhere you like.

I can also say, certain guns are faster. My win70 is slower than both a browning and remington I have shot with the same loads fwiw

Salmonhead