My Nosler #4 manual lists 4064 for the 160 partition...

Minimum charge is 49.0 and max is 53.0.. However, 4064 is the fastest powder listed and the load density is the lowest ( 61 to 66 %)..

4064 is a pretty fast burner to be using in a big belted case...Putting too much of it in there is a good way to set up a bolt, or worse...I've seen it happen ..

I really think you'd be better served to stick to slower burners for heavier bullets in the 7mm RM, like RL-22, RL 25, 4831 or 7828, and save the 4064 for medium capacity , non-overbore cases like the .308...

Good luck....