I've tried all sorts of helgramites and the wooly bugger and maybe Murray's helgramite seem to work as well as anything. BTW, in my youth real hellgrammites were a fabulous bait. I've tried many flies, any none come close to the real thing. Most large helgramite patterns don't have the motion of a live critter, or the smell either. The only ones that are close in motion are buggers and Murray's helgramite. None have the smell.