Wildcat, I will second the flourocarbon for these jigs, and most often on Pickwick and Ky lake, I will use either 12 or 15#, with 15 being the heaviest I will go. I have, on fairly rare occasions dropped down to 10#, but no lighter on the 5/16 and 7/16 oz jigs. On a lakes like Bull or Norfork, 8# might be needed, but in my part of the world 12 works fine, and gets you some margin for operator error. Mike Whitten/Germantown, TN