The 30-06 is fine for Elk. When I was younger, I used a .308 Win for cow elk up to 300 yards. Never had to do a follow up shot. One shot, on kill. My bull gun was a 7mm mag and 300 Win Mag so I could reach across the canyon if necessary. Shot placement is the key with any caliber. Once you have you gun tuned from the bench, practice realistic field shooting positions. Horsepower doesn't Compensate for poor shooting. A Texas heartshot with a 300 ultramag is no better than a .308 in the same place. Good hunting!