Yes,the dive charts use 10# diameter line.So the 15# will have a slightly wider diameter and will make your lure a little higher in water column than the chart says.But it should not be much,just another variable to where the lure is actually running.When starting out trolling try and cover the water column.I start out with a few lures running where I think I will catch fish, and have some higher and deeper.Let the fish tell you what is working each day.