I have 270 and 06. And have been my main go to for 10+ years. My 270 is dedicated deer rifle.
But now and only After 6 months, the 6.5 CM is my new favorite.
Ive seen it cheaper than 308 or the 270 and shoots just as good...actually better.
I Hate to be that guy.
With monos I’d choose the 270 with 130s over the 308

All of them do something better than the 30-06, but none of them do everything as well.