260 and Creedmoor are practically neck and neck. If I wanted a short action Sako, I'd go for one of these in whichever one I could get a sweet deal on a factory rifle on, with a preference for Creedmoor unless the mag would let me seat bullets out a bit further in a 260.
If you're considering a Tikka and can resist the urge to chop it, 6.5x55 starts making a lot of sense... Factory ammo is pretty sedate for the sake of old SE Mausers, but if you are going to reload in a nice strong modern action, there's no reason you can't make the most of the space and the extra case capacity the cartridge gives, to equal or exceed the performance of either 260 or Creedmoor.
It's not a dick swinging contest though. So long as it'll drive a big enough bullet, at high enough speed, to give it enough oomph to make everything perform as it should when it connects with the biggest animal you plan to shoot with it, as far away as you ever envisage shooting it, can't go wrong with any of them.
Or... 7mm08 if you want to share reloading components with your magnums.
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