Fly Size Chart. Pictures to compare various fly sizes. A very stiff fast-action fly rod casts well in this situation.
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It is important to match the two together.
For example if I was going to use a size 12 fly a 4X would be the appropriate leader and tippet selection. Practically all fly reel manufacturers offer fly reels for specific line weights. 32 to 33 Inches. Pictures to compare various fly sizes.