Sawyers grandson sells killer bugs on his site, & they are dressed using a substitute material. The real thing is always coming on the market somewhere or other & prices vary considerably as we have seen, there was even someone offering part of a card of 454 recently on ebay, I don't remember how much that went for, it was the closest colour but a fraction lighter.
I have cards of 477 & 454, I also have a very close knitting wool that's closer to 477 than 454 & use that for any fishing flies. Some time ago there was an article in Fly Fishing & Fly tying with micro photos of 477 and some subs. The differences were noticeable, but not significant to human eyes & film/digi photography/printing.
It's a confidence thing, if you want the real thing & think it's going to make a difference then "you pays yer money", look big & fish knowing that it's as the author intended.
There are hardly any wild fish these days, fish as far as we know can't discuss the intricacies & finite differences of colour with each other. So if an item of food appears & they're in the mood to take it, they most likely will.
Get some of the real thing & a good sub, fish the 477 first then the sub & then on another day the sub first then 477. See if there are any differences between the catch rates of fish that have seen both and gone for one instead of the other.
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