fishuntrapper

it would seem that the amount of backer below the water line should be at the least the depth you are trying to achieve. i do this with copper and lead core alike. both ends of a weighted line needs to be able to attain the target depth for the line to run at the target depth. in your example, you need 40 feet of backer below the water line. which means you may have to let out about 50 feet when you add in the line distance from rod tip to water line, or more when you use planner boards or side planners. hope this helps. it works for me .

it would seem that the amount of backer below the water line should be at the least the depth you are trying to achieve. i do this with copper and lead core alike. both ends of a weighted line needs to be able to attain the target depth for the line to run at the target depth. in your example, you need 40 feet of backer below the water line. which means you may have to let out about 50 feet when you add in the line distance from rod tip to water line. hope this helps. it works for me .