I'd steer away from the SST's. I shot a couple of antelope and a couple of deer with them last year out of a .270 win (130 gr) and I had jacket/core separation on on an antelope that I shot at about 200 yards after it caught part of the shoulder blade. I also had one fragment on a deer that I shot at about 50 yards. It killed all of them quickly, but I don't think they would consistently make it through an elk shoulder from what I witnessed, even with a .30 cal 150/165/180 gr bullet.
I'm with TG- go with an Interbond or something stouter.