Remington® Slugger® Rifled Slug Shotshells
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If it is a rifled barrel the Sluggers will lead it up and accuracy won't be that great due to the way the slugs are constructed (Rifled barrels work best with Sabot Slugs)
If your barrel is a smooth bore (a cylinder choke without rifling) then the sluggers will work as they are designed to.
Modified can work but be aware that there is a risk of damaging the choke as well as the barrel if slugs are fired through it enough.
*Some shooters have also witnessed the choke going down range with the slug after extended firing*