Considering fired brass springs back .002" to .003" that chamber is worse than you think. This is why I never recommend letting a barrel maker chamber or fit anything. Most use cnc machines programmed to the low side on the threads so they will fit any receiver and the reamers are held rigidly so it's not uncommon for them to cut oversized chambers. Additionally if using cnc machines they use carbide reamers. Those are production grade meaning that when new they can be up to .002" oversized on the body to allow more resharpenings. If you want a carbide min spec you have to special order it. Then factor in the guy running the cnc has no actual gunsmith training and after 15 minutes of instruction he is expected to fit 4 or more barrels an hour or go back to his broom.
You are right about case life. Sizing that much I would expect the body to split at about 4 firings. If they don't make it right you can make it work. Neck sizing only will extend the life and you could hone a sizing die specifically for this chamber if it came down to it.
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