AS,

To simplfy all all leader formulas, I measure from the flasher's edge (not swivel) to the back of the lure I am using (not hook(s) on all lures. I consider the swivel and ring an extention of the leader.

GST recommends measuring to the nose of the fly; however, simply add 4 inches to the overall length. This will still put you at their recommeded leader lengths.

Hope this helps!
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"If you are not scratchin bottom, you ain't fishing deep enough!" -DR

Puget Sound Anglers, Gig Harbor Chapter