Aint that the truth! I've been diving into this world for 2 months, this rabbit hole is DEEP. 270, 270WSM, 260AI, 6.5PRC, .277 Fury, 6.8 Western, 30-06, 7rem..... All are viable options. When you graph all of them, they're all very very close out to 200 yards and pretty close out to 400yards. Past 500-600 they can start to deviate a bunch.
I'd guess if anybody already has one of these chambered in a gun they, like, its not worth pissing around, but for somebody that's buying a new gun, its worth some time to see which is best for their application, longevity, cost, ect ect.
If you're a hand loader.....you can probably make any of these be beter than the factory version of the other.
The .277 fury may have a 7% gain over the 6.8 Western once it has a 165gr bullet in factory ammo.