my 2 cents
the 30-06 wins here IMO, due to well, ammo is out there normally every where from heavy to light loads, and tons of OEM's make it, so almost sure to find something your rifle likes!
next will be followed closely by the .308-.270
about same reasons, ammo is normally out there, and a wide range of choices
the 25-06, how ever the 25-06, as much s it can be a nice caliber, its more of a novelty caliber IMO ,
(I am sure many may disagree and OK fine with that too)
and ammo is not near as common or easy to find even in the best of times!, never mind the current times were in!
NOT a big deal iof you like to reload, but is a issue the other calibers just don't have as much of!(and you can reload for them as well with a TON of options and data!

from MY experience, barrels on 25-06's don't seem to last as long, so, if you plan to do a LOT of shooting, maybe food for thought, and also, if bears are on the list, it maybe a little on the lighter side of things, with the other 3 calibers being better suited for bears IMO