I have converted 8x57 1908 Braz and 7x57 VZ24s to 7mmRM and 300WinMag.

The bolt face and extractor mods are obvious on inspection.

The feed lips mod I got from a drawing in Walsh's book on Mausers.

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I was always suspicious he got that information from looking at Win 70s, although the only pre 64 M70s I have here were 30-06 and 308 from the factory.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps