ORIGINAL: stalkingbear
You CAN safely shoot ANY 12 gauge slug, but as the previous poster said, they may not be as accurate, and won't retain downrange energy or as flat of an trajectory. Sure they're (foster type rifled) cheaper, but you'll pay with less performance. The deciding factor would be if you need the accuracy? How far are you planning to shoot?
Agreed! If you want to shoot lead (foster type rifled) slugs, used a smooth bore and save you some cost on a rifled barrel? Sabots are more accurate, however cost more!