A few thoughts,
Early non releived target stocks were usually relieved inside just in front above the strain screw.
Iirc it wasnt the ejector star that struck the stocks it was the case heads but will have to double check that later, either way it left dents in the stocks and many people with OCD (like me) sanded those dents down, while it is a sin today back then the stocks were cheap and available, when rubber Pachmayers were in fasion in the 1980's-90's it wasn't uncommon to see a small box of factory SW wood stocks for $5 / pair at the cash register of small gunshops.
Modified wood stocks have some value to someone but not to most purist collectors.
The football relief cut seems to appear with the introduction of the Combat Magnum in 1956, coincidentally .357 cases are longer than .38 special requiring them to be pushed further back to clear the cylinder so don't think it's a coincidence.
While the wide target hammer, target trigger were available options on the Combat Masterpiece on special order I'd suspect the majority of them were purchased afterwards and installed outside the factory.