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There are many variable to consider when selecting right X, but two most common are size of fish you are going after, and size of fly you are using when going after them. A quick guide is as follows:
XFly 0 2-6 1 4-8 2 4-10 3 6-12 4 6-14 5 12-16 6 16-20 7 20-24 8 24 and smaller Length
One must also think about length of leader itself. Leaders are sold these days anywhere from 4 feet to 15 feet. There are many things to consider when deciding on length, some are variable like wind and water clarity. Other variable are static like size of fish, current, etc.
Typically easier it is to spook a fish, longer leader you will need to use. So The industry seems to have settled on 91/2 feet as a good all-around length. For everything from trout to steelhead to tarpon. It is a good length to handle for all levels of fly casters, and it gives enough distance between splash down of fly line and fly as to not spook most fish under most circumstances.
From this standard we can then begin to think of reasons we might need to adjust. Spring creeks or spring fed lakes will probably require 15 feet of leader. Whereas sinking tip lines used in spring run off will use as leaders as short as 4 feet. A weed choked largemouth bass pond will require a shorter, stouter leader, and therefore you will be able to muscle your fish away from snags. But a trout caught in a spring creek will have advantage because your leader will easily break off due to its lightness. Windy days might require one to shorten up a bit to ease in casting. When switching from nymphing to dry flies one might need to lengthen a bit.
Summary
I hope this has clarified and not complicated things a bit. What all this means is one must carry a good assortment of tapered leaders and even more importantly tippets with them at all times. There are many times I switch sizes in same day. If I am fighting fish deep in faster current during day, I might go down one X factor, and then in evening if I am dry fly fishing in shallow slow water, I’ll go up two X factors.
Not having correct tippet can handicap one’s ability to land fish, either by breaking off if too small, or spooking them if too large. It is a nominal expense compared to rest of your equipment, and a bad place to start watching that fly fishing budget. So make sure you’re well stocked for every imaginable situation before you hit water. I guarantee you at some point you will be glad you are.
Cameron Larsen is a retired commericial fly tier and fly fishing guide. He now operates The Big Y Fly Company. http://www.bigyflyco.com/flyfishinghome.html He can be reached at info@bigyflyco.com. This article will appear in the Big Y Fly Fishing E-Zine at Http://www.bigyflyco.com/Bigyflyfishingezine.html