I use some of this line in fly tying. Below is a Serendipity variant using 12# lead core as the body. This one still has the lead inside the braid.

I also use the 12 # lead core in place of .025 lead for weighting flies. Simply remove the lead from the braid. Keep the braid as it can be used for bodies. Regular fly tying .025 lead from Bass Pro is $3.29 for approx 1/2 ounce and 100 yards of 12# (.024) is $12.99 for about 1 pound. BTW 14# is .0267.