Do you have more information about the ranch hunt? If you will be hunting in the timber above the ranch in October or November, you will likely be able to get a less than 150 yard shot, and 300 Savage with a tough 165-180 grain bullet will be fine.
If its a late season hunt when the elk are pushed down to open ranch land by deep snow in the timber, you will likely have long shots across open fields, take your 30-06 and a range finder.
Shot placement is the key, look for a shot that will drill the heart and lungs without having to blow through the near side shoulder bones.
Enjoy your hunt!
