I'm running some old Fireline on mine Jay, 6lb diameter if I remember right on a Abu Garcia Ambassadeur 5 (nice reel!), plus mono at the working end, also doubles as a great set up for flat lining steel!
Always run it in free spool with thumb on when bottom bouncing walleye, the extra length and medium action are an asset for dragging bottom rigs, soft enough in the tip to drop back on hits without missing 'em, release thumb pressure for a few seconds, lock the spool and set the hook. It's also a great rod for trolling walleye divers and what not.