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Sometimes, the fish are just beyond your normal casting range, and you need a little extra distance. That's when you need to shoot some line during the presentation cast. This technique goes hand in hand with the double haul cast and will help you add some extra feet to your casting distance.
ORVIS casting instructor Peter Kutzer explains that the key is to wait until you see the loop unrolling in front of you before you release your grasp of the line. If you release too early, you end up feeding slack upward through the guides, which causes the flexed rod to "unload" and causing your cast to collapse altogether. You should retain your grip on the line until after the rod stops in order to properly shoot line at the end of your fly casting stroke.
To get many more tips and tricks to improve your fly casting, please visit our other online resources.
https://howtoflyfish.orvis.com
http://www.orvis.com/guide-to-fly-fishing