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You can use a sabot in a smooth bore, but accuracy will be shi#.
, but with barrels a relatively inexpensive option for many shotguns, I'm at a loss as to why people still use them.
I use a pumkin chucker for my walking gun. With open sights it is dead on at 50 yards. More than accurate enough for still hunting or doing drives. Plus the rifled slugs are much cheaper than sabots. So that is why I keep my smoothbore with foster slugs. I reserve sabots for my scoped stand gun.