Once again UncleNorby is right on the money. My hunting partner insists on shooting Remington sluggers from his rifled barrel. He gets impressive groups out to 80-90 yds,BUT the lead build up in his barrel's rifling is very obvious. I'm afraid he'll one day transform it into a smoothbore. He insists that the lead will come out with some scubbing. To me, that seems like a lot of work, and risks damaging the rifling. His response is that the money he saves using rifled slugs instead of sabots can buy a new barrel. Hard headed, he is.