For what it's worth I bought a pair of double vane flags for the 400 and 500 yard lines. They are no easier to see than a single vane the same size. You need bigger in my opinion. Sail tails come in different stiffness. First set I bought where not responsive enough. I got a second set with lighter material in raspberry and love them. The raspberry color really stands out plus I got them a bit wider and that really helped also with visibility.I have Graham rimfire flags, single vane. Double vane is probably better because I do sometimes catch myself blinking to check whether they’re angled in or out. I didn’t choose double vane because of their size.
Rimfire flags are more sensitive than centerfire wind flags. I think the pinwheels are kinda of heavy and reserved for centerfire.
I’m also contemplating sail tails instead of surveyor ribbon.
With some careful planning they can be packed quite tidy.How bulky are the dual vanes? I own/ travel with four.