If you choose to fish a Skagit or Scandinavian shooting head, you will need a running line. The running line attaches to the rear end of the shooting head and allows the caster to shoot the head a long distance. To be clear, this is not backing.

Running lines are made out of a number of different materials. Like all fly line, each material has strengths and weaknesses. Here are a few things to consider when choosing a running line.

Extruded

Extruded Plastic or Polyurethane Running Lines

Extruded running lines are the easiest to handle and are often the best all-around choice for beginners. They typically have a core strength of 20 to 30 pounds, which translates to diameters of about 0.024" to 0.039".

The downside is that the coating is formulated to perform within a certain temperature window. A line may cast beautifully in spring conditions when water temperatures are around 55°F and air temperatures are around 70°F, but it can become sticky in mid-summer when both water and air temps are considerably warmer.

On the flip side, the same line can feel stiff and retain memory in extreme cold. Bottom line: expect extruded running lines to change their feel and performance as the weather changes.

Braided

Braided Running Lines

Unlike extruded running lines, braided running lines do not change properties with air and water temperature. Braids generally shoot faster than extruded lines and tend to tangle less. They also float well, which can mean fewer loops to manage when shooting line.

The tradeoff is texture and grip. Braids can feel a bit rougher on the hands, and due to their slickness they can be harder to hold during the cast. Some anglers worry braids can damage snake guides, but in our experience we have never found that claim to be true.

Mono

Mono Running Lines

Mono is the least popular running line material of the three, mainly because it tangles the easiest and is the most difficult to hold during the cast. With that said, if you take the time to stretch it out, mono can shoot faster and farther than any other material.

Mono really shines in cold weather. Both braided and extruded lines can carry a lot of water as you strip them in for your next cast. That water can collect as ice in the guides and freeze your running line to the rod. Winter steelheaders often find mono to be the best choice in below-freezing temperatures.

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