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Foster slugs through a smooth bore, sabbot through a rifled barrel, shot through a smooth bore for the most part, but the shot in incased in cup anyway , so there should be no problems in a rifled barrel.
Shot in a rifled barrel is not a good idea.... for many reasons, excessive fouling of the rifling is one... and your patterns will be garbage due to the centrifugal force.
The rifling will impart a lot of spin on the shotcup producing poor patterns,rifling will build up alot of leading and plastic from wads.....not a good idea!