25# main line, 40# shock leader, 15-20# drop line for sinker all mono. i only drift fish for blues and use a 3 way rig. i set my drag for 30% of main line weight regardless of which rod its on. with a smooth drag and properly set you dont teally need any line heavier than 20-30# main line for blues or flatheads. you can go even lighter for channel cats. the shock leader keeps break offs down no matter what rig you use. catfish mouths are like sandpaper.