I use lead core to make sinktips and shooting heads. I just back the braid down the lead wire about two and a half inches, cut the lead wire, and use the now hollow braid end to tie a perfection loop at the end. Repeat at the other end and you now have a loop at each end. It sinks real fast! From what I have read, going to a higher breaking strength trolling line just means a thicker braid but the same size lead wire so it won't sink any faster but will be stronger.