"FX Superior STX Heavy Liners
These new barrel liners will be replacing the STX Slug A liners in the coming months. ‘Heavy’ denotes that this liner has a different twist rate better suited for heavier pellets and heavier slugs (as opposed to lighter weight Hybrid Slugs).
It is important to note that in order to get the optimum accuracy from FX Hybrid Slugs, users need to obtain this new liner. "
https://hardairmagazine.com/news/fx-superior-stx-liners-the-latest-introduction-from-fx-airguns/Look at the slugs you're shootin.
They don't have the bearing surface of a powderburner bullet, due to the lower pressure created by airguns.
Shoot a slug into a milk jug filled with water. You won't see a lotta rifling marks on the sides.
IIRC, the open airgun accuracy championships have been won by pellet shooters every year, tho the slug guys are catchin up.
