It might have been a new kit, does not say it was a functioning in spec rifle before it was demilled. It sounds like the extractor is functioning and sufficient energy to the bolt carrier since it is nearly ripping the rim off and you get good ejection. Nothing you said implies problems with the receiver at least to me. What I suspect is an issue with the barrel's chamber. I am thinking a rough chamber but they were forged barrels so I do not know how the barrel would have a rough chamber. I would try to inspect it carefully visually or a metal probe to see if there was in ridges. If nothing else a chamber cast might be a good way to check if it is in spec or observable problem. The simple test would shoot some 7N6 you know that would be in spec from a cartridge side where you can never be sure about Wolf.