I fish leadcore all the time. YES you can fish wormharnesses off them, you can fish sticks off them. Most if not all charter captains will tell you that they use them. The theory is that the leadcore will act like a snake in the water giving the bait a different more desired action. Now for the complicated part - I have several reels set up ( Okuma ) with different lengths of color set up. Each will produce a different depth. Say a 2 color would go down approx 12 ft., a 6 color would go down approx. 36 ft., a 10 color approx 60 ft. It depends what depth you're in and how deep you want to go. Don't forget if you had a 2 color on and had a 15 ft. diving stick you would be approx. 27 ft. down or if you had a shallow diver you would be approx. 15 to 18 ft. down. The size of reel would depend on the amount of colors that you want to put on. Give Jim a call at Ultimate Outdoors of WNY a call if you want to shop local.