I'm not certain about what ammo is available in stores. I'm also not certain whether a 6.5/06 is chambered by any gun makers.
But some of the cartridges I use wouldn't be, and id be worried more about finding gas than I would about ammo for them.
Id be willing to bet not many small town stores would carry 25/06s either.
I feel undressed without 50 rounds with me, and that's when I'm close to home.