Tying up some tapered trout leaders using Umpqua material...9' for 5x allows a 5 or 6x tippet to be added. I prefer hand tied leaders on weed/algae free waters, blood knotted to a 2 ' section of hard mono butt section. This butt is nail knotted to the fly line. NO loop to loop! There are many formulas for different types of leaders found on-line. I use a desktop tool for fast and smooth blood knots, available from Cabela's.