nsaquam,
Any action capable of holding the 6.5-06 is also available in a magnum version that would hold the .264. Some are even easily convertible. My .338 Winchester is on an FN action that was originally a .30-06. Took less than $50 to convert it.
And the .264 is safely capable of 3200 with a 140, using at least 3-4 of today's powders.