Mr. Forester,
I'll try and answer your question about mechanical changes from 1903 to 1936. There aren't any major mechanical changes, just minor ones. You mentioned the addition of a wear plate, they changed the top lever linkage to the bolt making the top lever shorter and changed from a flat spring to a coil spring for the top lever. The safety button was changed to a different style and they changed the sculpting of the frame to cut down on labor. They never implemented the major redesign to reduce the number of parts. I don't think the ejector system was redesigned once it was put into production but I could be wrong. Others can chime in if I missed something. The Parker Story goes into great detail on the changes.
You should be able to use any off the shelf load assuming that the guns are mechanically sound.
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