If I had a .30-06 I would likely jump over the 7mm's and go to a .300 or .325 WSM. I have hunted moose my whole life and taken them with numerous rounds. The .30-06 will kill just as well anything else. Elk on the other hand have a reputation ( never hunted them ) of being tougher to anchor and you might also run the risk of having another hunter anchor and claim your animal if it runs. I hunted for years with a .338 win mag and the last few have been using a 7mm rem mag which I love more everytime I drop an animal in its tracks. The 06 and 7mm are too close IMHO, jump up to a bigger bore. Or, save the money and buy a high end set of Binos or rifle scope for you .30-06 which as you say you like alot.