No sir, you have it backwards. Sabot slugs should only be used in rifled barrels and not smoothbores.
I think you misunderstood me, thats exactly the same thing I was saying. As far as shooting rifled slugs out of a rifled barrel, you can do it but I would not recommend it, and I've had a gun smith tell me the same. Those raised grooves on a rifled slug run clockwise, a barrels rifling runs anti-clockwise, you will have better accuracy out of a smooth bore. And contrary to popular belief those rifling marks on a slug are not so much to spin the bullet out of the muzzle, rather those raised grooves purpose is allow the lead to compress as is squeazes out to the choke end of the barrel, so you don't end up getting a barrel that looks like this.