Almost any fixed broad head from 100-125 grain will do the job…..what’s far more critical is your shot placement. Find the broad head that you like, and the one that shoots the best with the shaft you’re using and get comfortable shooting groups of 4”-5” consistently.
Forget the expanding...
They are the bomb! Have several elk that they have done, and also my sons first deer. He “helped”’skin it and they stitched all the holes and made it look amazing.