Kbrumback...20 is right on this one, I would not use those slugs. They are rifled...as in for guns that are not. Either the barrel should be rifled, or the slug, not both. Those are meant for a smooth bore gun. They attempt to create a rifled effect to stabilize the bullet using there "rifled" design.
More importantly 1).how much are you willing to spend on ammo 2).how important is accuracy to you 3).how far do you plan on shooting.
I can give you Sabot recommendations, but need to know those three factors in order to save you some time and money.