I would prefer .308 to .30'06, just because the latter is getting harder to find but you can always get a crate of 7.62 NATO.
The "oddballs" that jumped out at me were just the ones you named, .22 Mag and the Casull.
And the .270. I know that a certain gun writer was nuts about it, but it's not always easy to find.
Exactly... As has been stated here, .22 Mag can be a problem to find, although in bolt action, I believe that you can shoot .22LR just fine, although the accuracy might not be quite as good.
On the other hand, the .454 Casull is a fine hunting round, especially when using the Freedom Arms revolver. The best part is, that if you're out hunting dangerous game, once you've lit off the five rounds, if it's not dead yet, you can bludgeon it to death with this massive, heavy revolver!
Mark