There is a lot of discussion on these sites about reboring and re-rifling barrels as if it were something easily done with a dull pocket knife. It is a complex and expensive proposition and requires specialized machinery only a few companies in the country have. Most of the time it is much less expensive to simply buy a new barrel (or a new gun) in the desired caliber.
If you have an appropriate receiver and the .25-06 barrel is in good shape, there is no practical advantage in going to 6.5-06.
Jim
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