Spin, bore, and what's the difference?

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What is the distinction that makes some slugs ok to use in either smooth or rifled bores, while others are for one or the other only? Does it come down to whether the slug and/or sabot is designed to spin on its own? I have half a mind to dissect some shells and see what's going on in there.
Thank you Mr. Boole, but we are going with Rock/Paper/Scissors.

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