If I went through the trouble of buying a rifled barrel, I wouldn't be shooting foster slugs through it myself.
2 3/4 inch accutips for me. I am sub MOA with them most of the time. Secret to sabot accuracy is cleaning the barrel every 3-4 shots. Plastic fouling is bad and will start to affect accuracy pretty fast in my experience.
i also used Winchester BRI sabots for years before I switched about 10 years ago.



























