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"I've read that carbon deposits can really shorten barrel life..."
Glad I wasn't sipping coffee when I read that, my keyboard would have been flushed, I've been doing this stuff nearly five decades and haven't heard that one! I suspect what you've read is people trying to justify the time and high expense of doing something totally irrelivant to the quality their reloads. No one has demonstrated any benefit at all to shiney case exteriors or surgically clean interiors; justify it as we may, all we're doing with any case cleaning process is making them look purtier.
Those who claim it's easier to spot cracks in polished brass may be right - for themselves. I vib tumble to clean (never polish anymore) cases and size them before looking for cracks; what may have been a tiny, hard to see crack before sizing will become huge afterwards.
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