Leadcore has a max depth of maybe 40....these guys use thin wire 300'gets them 50-55 with a deep thunderstick,useing thin diameter(.012) along with the weight of wire gets the depth where lc and copper is more about the weight only that gets the depth.So the wire is more stable....doesn't go up and down in current,speed changes etc as much as lc aND copper,...the copper aND lc works just not as consistent for them once the eyes go 45 plus deep...on turns the copper drops so much it's in the mud in no time.I used a fishawk td with 200 of copper and thunderstik and trolling 2.2ish I got 40is feet deep......going the other way it was 60plus.We had tons of current that day.The wire with thunderstik stayed plus or minus 50-55'...current and speed has less effect on the wire than the lc or copper....But the wire is a pia....that's why I'm gonna try the 19 strand torpedo wire,a friend had good success with it last couple years and it handles great,so will find out....