Don't you mean western MT? I bowhunted elk for my first time in eastern OR in 2006. We had a fun hunt but the elk were few and far between and neither me or my buddy got a shot opportunity.
I've learned a lot since that trip about elk hunting and I'm sure it could be done in that unit if you had enough time. I was hunting the blue mountains near Baker and La Grande.
I'm not familiar with MT but from what I've heard, that would be my first choice over OR. Hopefully some other hunters can help you out in that state.