Now it's decision time to either break down my loads and turn necks, or just re-chamber to 260 Rem and not have to fire-form brass in the future.
I would give 6.5 Creemoor brass a try before re-chambering. Depends on your chamber but I bet you would be moving a minimum amount of brass as the chambers are so similar.
Likewise I would just bite the bullet and break down what you have, neck ream and reload. Even if you re-chamber you or at least I would pull the bullets and salvage the powder from the AI loads.