Both the Sierra manual and Speer manual show using .264 bullets for the Carcano.
The confusion with the different diameters may be due to the fact there are a wide variation in bore and groove sizes (Sierra reloading manual).
If you want to know the exact diameter of your bore, get one of the slug kits from Brownells and calipers. It should tell you, at a minimum, if the .264's will work properly.
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