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Pellets great, slugs can be great. But there is a substantial amount of jockeying with machining trying to get both to shoot their best out of one barrel. It’s not a cookie cutter cure all. The FX liner/barrel system has its consistency shortcomings, but they definitely shoot both without having to become a machinist. You just have to fix the consistency issues. And you can get them pretty good once you figure some stuff out.