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Shotgun barrels are thinner and inherently more fragile than a rifle barrel. The rifled barrels for shotguns are designed with the idea that the lead of the slug will never touch the rifling - only the plastic sabot does. It is my understanding that rifled barrels will lead up quickly if foster, brenneke, or shot is used in them. If the barrel is heavily leaded, then excess pressures could result. I doubt that 2 rounds would cause that much damage, though.
Personally, I wouldn't risk it. I've seen shotgun barrels exploded by a dove feather with a light field load.
Smooth bores: shoot any type you want to.
Rifled bores: sabot slugs only.
Sabot slugs gain spin from the sabot's contact with the rifling of the barrel. The "rifled" slugs(foster and brenneke) gain spin from air passing through the rifling grooves of the slug after leaving the barrel. Any spin imparted on a rifled slug while in the barrel is incedental.
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