I went out of the office onto the floor, so to speak.
The ejector seems to be cut from opposing sides w/ a 0.025" slitting cutter, as the terminus of the cut is 'v' shaped when viewed from the side(cross-section). Remington example at least.
First sample is measuring a consistant Rockwell 49.7 "C" (low 49.0 high 50.5) in the "spring" region. The ejector blade near the front runs approx. 42.5 "C".
Still haven't found my spares box, but I do have a P'14 that could be checked of required (Winchester). Not too keen about pulling apart the others.