Your typical rifled slug should be fine out of an IC choked barrel. I have slugs (Remington sluggers, I think) that state they're safe out of any choke, but cylinder bore will produce the best results. The purpose of the "rifling" on a rifled slug is not to impart spin, it's actually to allow the slug to be swaged down through a smaller choke (hence why Remington states they can be used with any choke). People will probably dispute that, however. As always.
Last edited by Scotty454; 04-22-2015 at 01:30 AM.
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