Lets go back to the OPs question. He is wanting to put a .308 chambered barrel (because they are very available I'm guessing) onto a receiver that is currently a 30-06. I go back to my point. I think the best alternative is to leave it as a long-actioned .308. You wouldn't gain much at all by attempting to rechamber the barrel. Just screw in the barrel, set the headspace, and shoot it.
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