I supposed your may be correct that was just a guess on a roughing reamer run in to far. All these are guesses, if we could get the OP to give us some measurements we might turn it into a game LOL. All said and done Winchester will take care of the problem, and he will have a fine 30-06 when returned. I wouldn't trash the manufacture for this as crap can happen, and no harm was done, nor does it look like it was even close. The owner is out of a little time, however he may be reimbursed with a hand picked barrel and a good going over of the gun by the manufacture.
Please let us know if Winchester gives a reason for this, I doubt they will, but it has a lot of people wondering.
Please let us know if Winchester gives a reason for this, I doubt they will, but it has a lot of people wondering.