I have used single strand monel trolling for striped bass in the salt water with good results, copper should produce similiar results. Lead core seemed to plane off and not reach the deeper depths like the wire and a strike on wire is definitely felt. I eventually went to down riggers for better depth control and the ability to fight fish on lighter tackle when I started salmon fishing in Alaska. I made up some shooting heads for the fly rod with lead core line, it will cast a mile and get down to the depth needed.
