RE: Rifled -v- Sabot Slugs
I haven't seen any slug guns that are capable of consistant groups good enough at 200 yards to take game. 150 would be pushing it, and I really don't think that will happen with any rifled slug.
The only way you will know is to shoot them at that distance.
Most I know sight in 1 inch high at 50 yards and that puts you close to dead on at 100. I think thats right anyway, someone feel free to correct me. I sight in at 100 yards. It really depends on the load you use. Different weight, velocities and BC's will give you different results.
Paul