With all respect to Wyosmith, I would never assume that a replacement barrel will headspace correctly just because the old one did, or even assume that the old one did. Without the receiver, there is no way to take the state of the bolt lugs and lug seats into consideration. If the original rifle was already over the line on headspace, there is no way to know that from the barrel alone, so copying it would leave the rifle with the new barrel as bad off as the original.
Jim
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