From a practical perspective, isn't a "machined" action machined from cast steel?? Cast at the steel plant?? Perhaps rolled into shape?? If so, what's the difference?? I gotta assume (yeah, I know what that gets me) that Ruger has to do some kind of machining after the casting?? Inquiring minds wanna know.
FWIW, I'm a died-in-the-wool Ruger fan, but have never spent $$ on much more than factory rifles to this point (a couple of used, rebarreled guns though), and am currently no kind of "precision" shooter.