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I have shot the 7mm RM for a long time. On deer I have used 130 gr Speer HC's, 140 Sierra's, 140 Partitions, 150 Coreloks, and 160 Sierra BT's and others.
Memory says that the Partition and 150 CL expanded and also penetrated well and the 160 Sierra could have opened faster but things vary.
Back then we had surplus 4831 and it was good. These days I load RL 22 in a 7mm WSM as the RM's are worn out.
Watch out and don't set the shoulder all the way back with the FL die as belted rounds blow it forward. Set the die to make the case fit your chamber.
Make a feeler gage from a wire to check on the inside of each case for an insipiant separation.
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