sure you can use the rod for lighter jigs. it is just that the jig s won't react the same way they would with a lighter rod. i always jig fish with a 500 or 600 gram jig rod and use 200 to 300 gram jigs and do just fine. i think that jigging with a 200 gram jig rod and using a 400 gram jig will wear you out a lot quicker than the other way around....rick