I tied some similar on a size 18 - which is as small as L can see. They look very similar in profile but had pheasant tail bodies and ginger seal fur collars and were very good with grayling last autumn.

The only problem was a lot of drop-offs and I think that the tungsten bead closes the hook gape down a bit on these small hooks, reducing their hooking effectiveness.

Has anyone else found this?

Gudgeon