Indeed they do, but they utilize some sort of counterweight system attached to the bolt which I assume delays the blowback long enough for the bullet to get out of the barrel. It as a rifle built around the 17 HMR cartridge instead of a rifle adapted to the 17 hmr cartridge.
If there will be an autoloader on the market for .17 WSM, this design might be the solution they are looking for. I bet volquartsen owns the patent, and this might slow down and constrict who makes them. Volquartsen will want to come out with the first one before they let anyone else do it.
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