nsaqam,
If 150 fps is significant, and more velocity always better, then why not go all the way to the .264 WM and get 250-300 fps over the 6.5x55? The .264 will fit in any bolt action the 6.5-06 will.
My point is that the 6.5x55 is neither a SA cartridge nor a LA cartridge.
If the exact same ballistic performance can be gotten from a .260 housed in a SA what advantage does the Swede give me housed in a LA?
While the "advantages" of a SA are debatable (to me at least) they are still measurable.
Not so the difference in the ballistics of the .260 v. the Swede.