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Whenever I find myself doublehauling, it's a sure sign that I'm standing in the wrong place and wasting my time. Long casts sell a lot of rods, but are seldom useful.
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LMAO, you don't fish for what I fish for or where I fish for it.
Cast a sinking line with a 10 inch musky fly (more than 20 feet) and NOT double haul and I'll kiss your ass.
Throw a weighted streamer on a sink tip or intermediate line from mid river (too deep to cross) across two seams to get to where the 20in smallie is and NOT double haul and I'll kiss your ass.
Fish a Lake Michigan or Lake Huron flat for 24inch lake smallies and deal with the wind effectively and NOT double haul.........well you get the picture.
About the only time I don't double haul is with my light trout stuff.
You think its a waste of time but instead of false casting 5 times with out a double, I'll pick up the line, shoot into the backcast with a haul and throw a haul into the forecast and cover the same or more distance as flailing away. In the end the double haul is about efficiency to allow you to fish more (you are only fishing when the fly is in the water after all) and if you can not cast a fishable distance for what you are fishing for or are having to false cast a bunch to get a workable amount of line out, well you ARE wasting time.
Just my 2 cents and over 2 decades of fly fishing opinion.
As for the OP's question: Load and Speed.
J-