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Dave,
I was hoping Richard Skeuse would know for sure. I know the custom rifle guys like the 8620 because it has a high enough carbon content to core harden to a perfect hardness when it is casehardened. This leaves a super hard case and a strong core, like 2 - 2 1/2 times the tensile strength of low carbon steel if I recall.
But the Repro looks like it was never case hardened. So, I was suspicious it was a 4xxx steel that was martensitically (thru) hardened.
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