I have no on game experience with the 264 despite owning 2-3 of them. I did however shoot one with Berger 140's out to 1300 yards one afternoon with John Burns rifle and it is a force of nature way out there....I was impressed...
But I bet with more "standard bullets" there is not much difference between the 270 Weatherby and the 264,aside from the heavier 270 bullet weights. I've only owned one 270 Weatherby that started the factory 130's at over 3400 fps from a 24" Lilja. With better bullets the two have to be pretty close at normal distances (600 yards?).
Both hold more powder than a 270 Winchester so I never thought the comparison was fair; plus the 270 fits much better in a lightweight rifle with a 22" barrel,making it somewhat more suitable for close cover hunting while not leaving too much on the table in open country.
