Now from what I've read: Copied from Remington's website
http://www.remington.com/products/ammunition/shotshell/slugs/accuTip_bonded_sabot_slug.aspPremier® AccuTip Bonded Sabot Slug
Power Port™ Tip delivers dramatically superior accuracy
Spiral nose cuts and proprietary bonding technology control expansion at all ranges from 5 to 200 yards
Huge .58-caliber slug is the largest tipped slug available today
Over 95% weight retention – weighs more after impact than all the others start with!
Slug jacket made from high-strength cartridge brassDesigned for use in fully-rifled barrels only
The part I question is the jacket is made out of brass, how well is this to clean out of the rifled barrels?