When a thing starts life as a lie, don't expect much from it.
Nosler tells us that it has more velocity at 400 yards, than the 260 does at the muzzle. A quick glance at Nosler's reloading manual shows that to be B.S.
Now compare the 260 with the same new magic bullet.....
Try a thing because it's different, not because you were told to.
If you just want speed and ubber-magic. I've got a Large shank Savage barrel in 6.5*300 WSM for sale....