If you’re not hitting vary your location and strip method before changing off black since every Muskie lake I know of in WA is clear. I haven’t fished them for a long time but my childhood friend consistently grabs one at May on a 10” black fly from Lost Creek Fly Shop.
truth be told, I'm a little biased...nearly all of my fish have come on black, but I also fish black (or some variation of) nearly all of the time. I DID have one of the largest fish I've seen out there eat boat-side on a 16" pink fly....but I completely blew the hookset.
by and large, I'm fishing stuff like this (although often in singles):
generally a little smaller though (that said, this is only 11"). I honestly wouldn't be surprised if color matters less than we think. Once you get confidence in a particular fly/color/size/etc., you'll tend to fish that more than anything.
Thanks. It's more an impression of bulk than actual bulk. There's a lot more to that than it looks...both to give the impression of bulk and to give it the action that I want (more of a walk the dog type action on the pause). When in the water, they look a little more like this (this is a bull trout fly I fished on Sunday):
My dad and grandfather fished for muskies in Wisconsin, Minnesota and Ontario for decades, caught lots of monsters, and used only one type of lure...a big black bucktail spinner with a copper or tarnished brass blade.