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Larry,
I am an armorer and hobby gunsmith. Yes, chambers should be smooth because a rough chamber makes for hard extraction; especially with near max loads. Should it be highly polished? I am sure that can be overdone to not much good purpose. More important, in my view, is to have a DRY chamber so the fired case can grasp the chamber walls and reduce thrust on the bolt face.
Adam
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Adam Helmer
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