one odd thought here.
Winchester simplifies there design to go cheaper.
But didn't Ruger start up right after that, and make the same claw extractor configuration that Winchester just dropped.
spotshooter the Ruger M77 was not a CRF,and the extractor was not the same as a pre 64. The receiver(and likely other parts,too) were an investment casting(think that's the term). The extractor on the M77 does not function the same as a pre 64; the M77 was a PF rifle.
OTOH, pre 64's receivers were machined from a billet of 4140 CM. Far as I know, there were no castings on the pre 64.
