Hi skip,

The old rule of thumb was to have the butt section 2/3 the diameter of the
end of the fly line.

Another approach is to have the butt section at least the same diameter of
the large end of your knotless tapered leader.

I think that a 7 1/2' 2x leader would be fine.

Usually the larger pound test knotless tapered leaders have a larger butt
diameter for turning over bigger flies..

--
Bill Kiene

Kiene's Fly Shop
Sacramento, CA, USA

Web site: www.kiene.com


"Skip Summer" wrote in message
om...

Planning on using some mono to connect flyline
to leader, using a nail knot. What pound test
mono should I use? 4 weight flyline.
This rod will be used for bluegills.
Thanks in advance for the help.
Skip