I would be quite happy to take a 243, 6.5 Creed, 270 Win, etc,.
400 yards and under hunting deer.
Interesting Sam, and I can’t find fault with your thinking, except that I’d put elk in the “deer” category, lose the 243, and extend the range past 500 yards.
My favorite 2-Rifle Montana Battery has always been a 243 and 270. But if a really practical soul wanted to distill those two into one, it would definitely be the 6.5 Creedmoor. It genuinely does most of the work of those two.
Quite a round, going back over 120 years...