Found producer: 6.5 Carcano with .268 bullets
I found a small ammo producer in my state that makes 6.5 Carcano ammo: Wisconsin Cartridge.
I sent an email asking if they use .264 or .268 bullets. His reply, "We use foreign made .268" diameter bullets in the 6.5 Carcano."
I have never purchased from this site before. Prices as of this posting were $35 for 20 rounds of 120gr Soft Point. Not exactly cheap but less than the Milsurp Munitions ammo, and in stock.
They said they have no intention of selling FMJ for Carcano.
wisconsin cartridge dot com
If someone has purchased from them, or does buy from it, would love to hear how the ammo works in your Carcano.