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My Jorgensen handbook agrees with your findings re 4340 at 363 Brinell (soft)
It also shows hardened 4340 (555 Brinell/55 rockwell C) to have 280,000+ Tensile, 220,000+ Yield and 10% elongation.
I have made some parts for the M-19, 40mm repeater and If I recall correctly, the hardness specs were in the 53 to 56 Rc range.
One of the nice things about medium carbon 4340 is that it is hardenable all the way through in fairly large sections. And....it can be hardened while remaining quite tough.
Not tryin to throw a damp diaper at the project but since the .50 is not only a relatively high pressure round, it applies that pressure against a large area. If after thorough research, you do it and it works......that would be way cool.
Sam
Sam
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