I'VE NEVER TRIED CHALK STRING LINE, BUT FROM QUITE A FEW YEARS OF ICE FISHING FOR FT. PECK PIKE AND WALLEYE, USE AT LEAST 80 LB BRAID. 100 LB TEST EVEN BETTER AS THEY ARE WELL KNOWN FOR EATING YOUR MINNOW AND THEN WRAPPING THEMSELVES AROUND A SALT CEDAR BUSH OR ROCK. I'VE ACTUALLY UPROOTED AND PULLED IN BUSHES, CUT THEM THEM LOOSE, AND CONTINUED TO PULL THE PIKE IN. IT COSTS QUITE A BIT MORE, BUT IN MY OPINION, WORTH IT. IF IT WEREN'T FOR 100 LB BRAID (TUFLINE XP AND POWER PRO BRAIDS ARE WHAT I USE - CLINT AT HELL CREEK MARINA USES 130 LB TEST ON SOME OF HIS TIPUPS) MANY TRIPS TO PECK WOULD HAVE BEEN DISAPPOINTING WITH BROKEN TIPUP LINE AND ONLY SMALL FISH! ANOTHER PLUS TO BRAID IS IT'S THIN DIAMETER (100 LB TUFLINE = 20 LB MONO DIAMETER .018"), MUCH THINNER THAN CHALK STRING LINE. JUST A THOUGHT.