IMHO the Swede offers advantages over the calibers you mentioned. More power than the .243, and less recoil and noise than the .270 and .30-'06. About as good a round as the .308, but again with less blast and recoil. Even during this current ammo panic, I've had no problem finding 6.5x55 ammo, certainly a round 'traditionally associated with hunting'.Here is something to think about. If you are planning to...
-Buy a rifle traditionally associated with hunting
-Not compete in any organized long distance shooting competitions
-Want to expand what you are capable of as an individual for the sake of becoming a better shot...
I suggest you also look at .243 Winchester, 270 Win and 30-06. All are affordable, everyone makes rifles and ammo for them and all can give you excellent accuracy. Don't get me wrong, 308 Winchester is a great caliber for those who don't reload. Maybe in a few months you will be able to find some ammo for it as well. Buying a slightly different caliber will distance yourself from the large group of people who go crazy for ammo every so often. Sometimes people latch on to the idea that they need to shoot a caliber that is associated with competition (or police/military/tactical) so they can shoot "match ammo" without realizing that there might be no practical benefit the way they are going to do it. Just a thought.