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Good bank of info for new and old. Click on your rod.
scientificanglers.com
Scientific Anglers Spey Chart
Selecting a proper Spey line for your rod can be a daunting task. There are a variety of factors to consider when making your decision- rod action, style of fishing, type and size of flies being cast, and more, all factor into this. Because of all these considerations, the following chart is...
scientificanglers.com