if the plan is to use the rod for jigging for tuna in GOM , then 200g-300g will be the normal range, up to 400g. The depth of the fish (200'-400'), speed of the drift (wind) and the current speed more often than not require using a heavier jig. For example on the last New Bucc trip (Dec 13-15), the Friday night fishing was tough. It was windy, had swells, a strong current and the fish were marking fairly deep 200+. Using a 300g jig, the jig would sink out at an almost 45 degree angle. It was very hard, if not impossible to get your jig into the fish zone. Under good to fair conditions, 200g would be my minimum recommendation. My go to jig is a flattened diamond glow, 225g (8oz). On Friday night, that jig just floated out, never got deep. I had to move up to 350g (12oz) version of the jig before i had any success. On Sat night, much better conditions, the 225g worked perfectly.