I believe Ruger Investment Casting also manufactures the Montana 1999 action which seems to be heald in high regard on the fire.I own one Hawkeye and one Montana, both work just fine and are strong. I am a designer in the fishing industry and work mainly with aluminum of various types and they all work. We also use different types of steel and titanium for guide frames. It all depends on applications. I am no expert on investment casting steel but back when Ruger developed the process they are using I think it was pretty new( I could be wrong). I may be wrong here but I think the tolerances on some fully machined actions are a bit tighter.