I don't mean to sound critical in anyway BUT the OP should not posy anything about machining methodology or problems encountered because he plainly has no knowledge of the subject and his postings just muddy the already-murky waters. If I saw the unaltered, original barrel, even without the action, I would have a pretty good shot at determining what isues existed. Otherwise I can only guess at it. I may have some opinions and suspicions, one way or the other, but since they are only conjecture, I can't or won't voice them.
I do think the OP would have done better to keep quiet. He did little to help the shop which re-barreled his rifle. If he had simply said, " Look at the neat rifle Harley made up for me", without trying to slag Cooper or the retailer, he might have been better served. If he had been capable of presenting a coherent and precise description of the problem which existed, everyone would have been better served. To present a barely understandable rant then to go on and try to explain machining difficulties when the subject is plainly beyond him was a mistake.
I also have to say, I really dislike comments about guys who work out of their garage. I have known some supremely gifted gunsmiths, gunmakers, barrelmakers, etc. who have worked out of their garage or basement or converted chicken coop. It is no measure of their abilities or lack thereof. It's just a snide comment.