I ran across this knot and I was wondering if anyone has ever used this knot for copper. I gave it a try today with copper and it seemed to work pretty good, and the copper doesn't get doubled over so the splice is nice and small. I also tried it with mono and fluorocarbon and it didn't wrap up quite as nice but I think it will work as well. http://www.fishcrack.com/fishing-101-how-to-tie-the-fg-knot-strongest-and-thinnest-knot-for-braid-to-mono/