Yeah. It's funny how a cartridge from 1891 keeps up and is still the one that's compared to.

W.D.M. [Koromojo] Bell killed 300 elephants with the lesser 6.5x54mm Mannlicher-Schoenauer and only gave it up because the ammo of the time wasn't reliable in the African heat. He and others thought it was the best for lions as well.

Think on this: if you take the 20 or so suitable powders and start testing the 100 or so available .264" bullets with, maybe, five different powder loads for each - that's 10,000 combinations before you even start playing with cases and primers, seating depth, etc. No wonder the 6.5mm offerings overlap!