I have done a lot of shotgun slug shooting and yes a cylinder bore or modified will be most accurate with slugs however, if you purchase a smooth bore pump action with screw in choke options just put the improved or modified choke in it for shooting rifled slugs. They are quite accurate and will hold 4-5 inch groups at 100 yrds . The reason people think they are not accurate is because most are trying to do this with only a front bead for sighting. If you have front and rear iron sights or a red dot or scope they will absolutely group well at 100-125 yrds no problem. I have a 12, 16, and 20 gauge and they all can hit a pie plate at 100 yrds.