Basically you can figure about 22 ft per 100 ft out on the usual copper and roughly 5 ft per color for the leadcore so as an estimate 50 ft for the 10 color and 66 for a 300 copper. Trolling speed, lure, current etc. affect the actual depth. You can get increased depth by adding clip on weights to either option. Another option would be to run a shorter section of leadcore off one of the downriggers and control depth that way but still have the possible "attracting" factor of the leadcore itself whipping through the water. Iusually run it off inline boards so it is out of the way and then is on top of the other stuff vertically as well if something hits it