I did a lot of research regarding this topic and I initially had considered 300 win mag or 300 wsm, which I already own guns in both. But after the research, and mostly based on the guide's recommendation, I bought a couple of 6.5 PRC's. It will be a combo hunt also for mule deer. The guide actually recommended 6.5 Creedmoor and said they had been having tremendous success with that caliber on elk and he steered me away from a true magnum. I suspected, although he didn't say this, that a lot of clients don't shoot magnums very well. I knew we could and do, but again, simply went with the suggestion and my research seemed to indicate that given reasonable distances, proper discipline for shot selection and good shot, the 6.5's should work very well.