The .264 will be close, I've got one of those too and get 3300 fps with 120 Nosler Ballistic tips with a load that isn't even max by Hodgdons data. The .270 Win is out-270ed by a couple of other .270s. The WSM and Weatherby will handily out-run the Win with any bullet weight, and I have trouble seeing how someone could shoot one and not the others. I've got both of those too, the WSM in a Kimber Montana which will do until an ultra-lightweight comes along.Its sort of fun to shoot, I actually marvel how much performance that little thing kicks out. My girls call it the helium gun, and giggle like the school girls they are. *note to self; must ask what's so funny.
The .270 Win is a sentimental favorite and I have a couple of the FN manufactured M70s. One's a featherweight with a grade 11 wood upgrade and the other is a Cabellas 50th featherweight Supergrade. Interestingly, one makes 3100 fps with 130s and the other is only doing 2890 with the same max load. 130 SST and 60 grains of H4831. That's not bad, but isn't the 3500 that the Weatherby kicks out, and the close to 3300 the WSM does. Real velocities, not book.
I did load up some 110 TTSXs in the .270 Win just recently, probably thinking along the same lines you are. They shot so lousy in both rifles that there wasn't any use chronographing the loads so I'll likely never know if they will out .257 the Weatherby.
Playing with cartridges is fun, and cheaper than drugs. My favorite for the most for the least is the STW, which while not kicking much will stomp all over the 25s, 264s, 270s then just for fun go over and pick fights with the .300 Mags too. Not that theres anything wrong with the 300s, they just seem to be too much of a good thing for many shooters. The STW is the one that put me out of the .270 business for a couple decades.