I have a 20" slug barrel, cylinder bore, non-rifled. Drag stabilized would be like an arrow or tank round. I didn't know how sabot slugs were stabilized. That is why I asked. Thanks for the information.There are two primary types of shotgun slugs …. one is a rifled slug which is intended for smooth bore shotguns, preferably with a "cylinder" choke. The other type is a smooth sided slug intended for barrel with rifling. It's never a good idea to use a smooth slug in a smooth bore or a rifled slug in a rifled bore. Not only will accuracy suffer, a smooth side slug can blow the choke out of a smooth bore barrel.
As far as I know, all slugs for shotguns are spin stabilized and will usually maintain stability for at least 100 yards. I never heard of "drag stabilized". Maybe that's what arrows or rockets with fins use???
I put a document in the forum E-Library titled "Shotgun Chokes and Related Issues". Slugs are also covered so you might want to take a few minutes to read the article. Here's a link: https://rugerforum.net/e-library/83808-shotgun-chokes-related-issues.html