I love the 264, have a nice M70 that really shoots. Also have experience w/ 270 Wby. It might be heresy, but I'd go w/ the Weatherby. Case capacity slightly more, I like the long neck better, factory ammo is first rate.
The only reason my 270 Wby hit the road is that particular rifle (Mk V) did not shoot as well as the 264 (a factor of the individual rifles, not the cartridge).
In handloading, I will tell you that the 264 is a bit finicky, and will print different loads to significantly different points of impact. Not a big deal for me, as I find the load I like and stick to it.
