All sabots are designed for rifled barrels. Shooting a sabot out of a smooth bore will not work very well in most cases. Some times you get lucky though.
Are you talking about the brenneke rifled slugs especially for rifled barrels? If so that is what the gold magnums I am use are. The ones I have are actually the rotwiel's I think, but they are the gold slugs with the fins pointing in the opposite direction and said to be made for rifled barrels.
The shoot ok out of my gun, nothing special though. Pretty good at 50-75 yards, but at a hundred they are more like 4 or 5 inch groups for 3-4 shots.
And they still fouled my barrel up, even with the "special coating" they use.
I'll just have to keep my shots under 100 yards is all. I just want to see what the 600 grn slug will do to a deer compared to my 300 grn XTP's out of my muzzle loader.
Paul