If it implies tumbling I could see a higher drag from the smooth bore vs rifled. The spin imparts stability and keeps the bullet in a pointing direction of flight while tumbling will expose more surface area if the round turns pointing sideways to flight
geojon7 t1_jajlr42 wrote
Reply to Does the spinning of a bullet have any effect on its drag? by Eastern-Ability8411
If it implies tumbling I could see a higher drag from the smooth bore vs rifled. The spin imparts stability and keeps the bullet in a pointing direction of flight while tumbling will expose more surface area if the round turns pointing sideways to flight