Rifled slugs are safe in a rifled bore and there is much contention whether there is excessive leading of the grooves and if polishing might diminish this as we all know lead bullets in rifled bores are common...
But I must clarify the following...
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Rifled slugs were designed for smooth bore to impart spin.
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Actually spin is not intended nor needed with a traditional "rifled slug"...
What you see are actually just there to give a good seal in the barrel knowing shotguns have such variation to dimensions... The limited surface area raised in the form of the rifle grooves allows the slug to swage through various constrictions up to and including old fashion "full" choke but maybe not a "turkey full"...
They got called "rifled" as a marketing ploy by the first ammo house to put an angle to the lines...
These slugs do not need spin because they fly with the badminton shuttle cock physics...
They have a hollow butt and heavy nose...
Brent