if you are using super copper this is from there website, http://www.coppertrollingwire.com/copper-fishing-line-depth-chart-dive-curve/ These sink rates are estimates and should be used as a reference only. Conditions of measurement were fishing directly into a current, 2.7 gps speed, fluorocarbon leader with magnum spoons. 32# Super Copper (.030 in diameter) 25′ copper – 5 feet down 50′ copper – 10 feet down 75′ copper – 15 feet down 100′ copper – 20 feet down 150′ copper – 30 feet down 200′ copper – 40 feet down 250′ copper – 50 feet down 300′ copper – 60 feet down 350′ copper – 70 feet down 400′ copper – 80 feet down 450′ copper – 90 feet down 500′ copper – 100 feet down 550′ copper – 110 feet down 600′ copper – 120 feet down 45# Super Copper (.038 in diameter) 400′ copper – 90 feet down 500′ copper – 110 feet down 600′ copper – 135 feet down 700′ copper – 150 feet down 800′ copper – 165 feet down 900′ copper – 180 feet down 1000′ copper – 200 feet down Note that 32 lb copper is only .008 smaller that 45 lb , in my opinion its much easier to use. look at this thread it should help some or do a search on copper . http://www.greatlakesfisherman.com/forums/showthread.php?t=25536&highlight=super+copper