Smoothbores are for shot or round balls. They are generally very inaccurate. Rifled barrels deliver better accuracy with round balls (or sometimes conical projectiles). Rifled barrels cannot shoot shot very well.
Rifled barrels with a twist of 1 turn in 50-66" shoot round balls very well. Barrels with twists that are faster-1 turn in 48" down to 1 turn every 21" are better suited for conical or modern projectiles,but will also shoot round lead balls.
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