Standard Winchester super x rifled slugs work better than Remington slugger from my experience. 2" groups from a 24" break over with those. Now Winchester makes rack master slugs. Higher velocity, more aggressive rifling, & 1650fps from a 1 1/8 oz foster slug with winglide plastic stabilizer out of a 2 3/4" shell. Idk what the accuracy is like. Federal makes slugs with truball technology. Basically a ball bearing between the slug & wad so it can move freely & be more accurate. They also offer a high antimony lead version that's copper plated for deep penetration. If a basic rifled slug can do good I'm sure they do too. I'll post a pic of internals from the slugs.
Left to right: Winchester super X 1oz hallow point rifled slug 2 3/4", Winchester rack master 1 1/8oz hallow point rifled slug 2 3/4", federal premium deep penetrater 1oz hallow point rifled slug 2 3/4", federal premium 1oz hallow point rifled slug 3".