I have been building up my leadcore sets ups for 4 yrs now and use 2 through 10. Can cover depth in 6 foot increments from 12' to 60'. I would recommend 4 & 5 early season and 9-10 later when fish move deeper if I had a limited choice. 300' of 30lb braided backer, 27lb leadcore and 70' fluorocarbon 17lb leader. If you use big boards you can use mono backer.