Part of the reason the WSSM's fizzled was they were shaped so differently they'd only work in bolt actions specifically made for them. As a result, rifle loonies couldn't rebarrel common actions for them. The .22 Nosler works in any action suitable for the .223 Remington.
Maybe the WSSM's sold very well in the beginning, but aside from me, I've only known two people here in Montana who've owned one, and during my travels to hunt in many other places have never run into anybody else, anywhere who hunted with one.
