Big 406 fan here .
My early Phillipson 8.5ft rods absolutely love the 406 wf7 line .

I love the “tuned” classic style taper
The slightly thinner profile with the AST coating Shoots through the tiny guides of these old phillipson rods like a champ .
Will deliver a #4 cone head bugger to spooky smallmouth with a minimum of splash .
Floats and Mends great too ..
I love the supple and smooth casting of the 406 wf than some of the more modern tapered lines I’ve tried on these rods.
I know they aren’t marketed to cast for epic distance but the WF line will sling it out there with the best of em . 60ft cast is easily doable with just a single haul and smooth shoot
If stealth presentation or slick shooting are your game than 406 is the Name.. no matter what the price!
(Not a paid spokesman)