@dnsn before you go the route of resizing your brass from .308 to .260 ( which isnt difficult )
Keep a couple of things in mind.
If your getting a new chamber reamed then it could have close tolerances, this will be a problem with repurposed brass as it could have thicker neck walls.
So when you add your projectile into the case mouth, the total width will be too great and the loaded ammunition wont chamber.
You can over come this by neck turning the case neck walls down a little thinner.
If you dont have a neck turner it will cost you a bit to buy one, so the "cheap" .308 brass just got dearer.
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