Dave, I would use A2 or D2 air hardening tool steel. After hardening I would draw the screw down to Rc 28-32 You want the screw to be tough but not brittle. I would also check the fit of the hammer to the spindle it should fit fairly snug so that the screw is doing minimal work. Something is side loading that screw. As you know those screws are not that strong so any side load will just pop the heads off.
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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