Lee F: Accuracy is excellent with Lightfield slugs through my Remington 870 rifled super slug barrel with cantilever (Leupold scope). Pick up a box and you'll see how accurate they are. My 870 is sighted in at 75yards. I hate to say my group size in inches, but they are tight. Yours could be tighter, or not. These babies work.
I'm sorry that I have never sighted in shotgun slugs past 75 yards in 35 years of deer hunting. It's due to the terrain I hunt in I guess. 200 yards for a standard slug gun in my opinion is stretching it. I feel the pins inserting into the Wags voodoo doll after that last comment.