It's a factory Remington rifled cantilever barrel. I'm a clean freak so I don't think it's that. In the last three weeks I've shot Lightfields, Rem Copper Solids, SST's, Ferderal Barnes Vital Shocks. I've spent some big bucks on sabots. I was wanting to try the new Remington Accu Tips but I just can't bring myself to pay $20+ Tax for a box of 5 slugs. Today I was shootin plain Remington Sluggers. My trouble started with the changing of the scope so, I'm gonna maybe change that out this week. I've got a good Bushnell 1.5-4 shotgun scope. I'm thinking that new scope might be the culprete.