I'll be doing just that up north next week, and so I started to check my fly supply. Some of my little BWO dries are shown in the photo, along with a dime for scale. Yes, they're tiny--generally size 20 on down to some 26s. And yes, they require 6X or sometimes even 7X tippet. In recent years, I've had the devil's own time trying to tie one of those little things to a leader. I just can't see that well anymore.