I've been mulling over the same question as the OP. I just ordered a 6.5 CM Montana and in addition to Muleys and Antelope, figured it might work pretty well cow elk if I drew another view tag next year. I've grown to really like the 140 AB in my .270, seems like the perfect all around bullet for the chambering. When considering the Creed, with elk in mind the 140 AB seems like a good option, but I kind of wonder whether the 130 AB might provide enough penetration and give a little better velocity/trajectory.
I think I'd be less confident using the CM if I draw a bull tag this year, on the other hand, I've got a friend at work that has killed a pile of elk over the last 40 years with 165gr factory Interlocks out of a .308.
