I also vote 270. 6.5 Swede is lovely, but a good hunting rifle should have readily available ammo.
Bit more recoil, but a 300 Win mag is available in just about any gun shop in the world.
Personally I would avoid 308 or 30-06 hunting rifles, as various countries will have it prohibited, and they don't do anything not easily done by a 300 Win.
If the 300 Win is too much for you, I suggest some cupcake flavored vodka to ease your pain...
