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We are getting past my pay grade. I don't know what I'm talking about...
But 8620 alloy steel is good for investment casting. (What Ruger is good at)
It can be case hardened but they put something in the alloy that decreases possibility of embrittlement.
It walked off somewhere,but I used to have a Jorgensen Steel supplier handbook of alloy and tool steels. Light reading!
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