I bought a line last summer at a garage sale for $.25, ya a whole quarter. Anyway it's in a ziplock bag that's labeled "Grand Spey X9 1600 Grains 10/11". I have a 15' St Croix Imperial 10/11 but 1600 grains seems really heavy. Not sure if this is an old way to label Spey lines or what? Would this be good for cutting down for a 6 weight 11' switch rod. I hate to think I wasted a quarter. Any help would be appreciated. By the way it's light green and has no loops. No label to tell the maker either.