7mm RM/150 grain Partition for elk?

[luv2safari]

Hey all. Looking at my first western hunt next year and want to try elk while I’m still young-ish enough to climb and hustle. I’m nearly 100% taking my 7 REM Mag, and looking at the bullet options. I’ve had excellent luck on deer sized game with 150 grain Partition bullets, and wondered how they’d hold up on elk? I see several comments on 160 grain partitions but not much on the 150?
Thoughts?

I used the bullet in my Husky small ring 98 design 7X57AI some years back, and it worked just fine. You'll need to remember if a well hit elk is still on his feet and moving, send him another round.
My back up rifle is a 6.5PRC with 142gr ABLRs

I'm considering the 175 ABLR in a new Kimber Mountain Ascent I have on the way for my NV elk hunt in November but need to know whether a 1:9.5 twist rate will stabilize them? Shots could be 400 yards +. I turned 79 a week ago, and this will be my last elk hunt. Neuropathy is chasing me faster than I can run.