Can you use a .30-06? It's way better than what Mark had (his client had the Glock 10mm apparently) but worse that the above. It'll do better if you use premium 200+gr bullets. But if you get to pick, the .30-06 is not the best thing to pick.
I assume you're referring to Mark Uptain. That was a bad deal, in 2018.
You do realize though that they hunted in the heart of Wyoming's grizzly country, and the outfitter he worked for and many other nearby outfitters had promoted (and still do) .270/.30-06 class rounds, with most any decently constructed bullet for their elk hunters, right?
