If you reload, it's easy (but you don't). Tradex has brass and bullets (and common 6.5mm 0.264" bullets can be used in a pinch) and Lee makes dies.
You have an interesting idea and a good discussion ensued, but there are multiple reasons why it's not a candidate for rechambering: e.g. bore diameter, boltface size, the magazine arrangement (uses clips), it's a poor candidate for scope mounting, etc. The action is very strong, certainly strong enough for 260 Rem pressures, but gas handling is not great.
I'd abandon the idea to rechamber it, and sell it and buy something else with commonly available ammo.