Then you have to work "backwards" - if you are talking a deer how far away, in all types of wind and weather conditions can you "always" hit an 8" pie plate?
IF that is 600 yards, then you check ballistics charts and see what bullet at what speed would still be packing 1000 foot pounds.
But if you can't hit that pie plate @ 400 yards it really doesn't matter if you are pulling the trigger on a 223 or a 375 H&H, because neither is lethal if you can't hit the target.
I would say over 90% of "hunters" (not precision shooter) have rifles that are far more capable than them at taking down the target. A factory loaded 165 grain, 30.06 Accubond from Nosler is still making a "bambi killing" 961 foot pounds @ 700 yards - how many "hunters" are capable of hitting an 8" pie plate in even a very calm 5 mph cross wind @ 700 yards?
So hunting with a "very common" 30.06 would give you about double the "effective kill range" that the "average hunter" would be comfortable shooting.
The 7.08 again with "off the shelf" 140 grain Accubond's (Nosler factory stuff) is making 1008 pounds @ 600 yards - so really, how far do you "realistically" want to shoot?
At 300 yards that same 7.08 would be making well over 1600 foot pounds, enough to take down a Yukon Bull Moose - and the 7.08 would be considered by "many" to be a "minimal moose caliber".
So if you wouldn't pull the trigger at more than 300 yards max, the 7.08 is "more than you need" for any North American Game Animal - it's all "perspective".