I've read a few threads here (from last year) in which members bemoan the unavailability of 175-grain RN bullets for the 7x57.

In case that's still a problem, I'm here to say I just ordered 250 of them from Rocky Mountain Reloading.
Full disclosure:
1) these are pulled bullets (factory hunting loads).
2) I have not seen them yet.

That said, here's the link, provided in hope that someone else might find it worth looking into. (It was for me: I'm trying to get better performance out of my Spanish m1916 / Ludwig Loewe Mauser Espanol).

Link: https://rmrbullets.com/shop/bullets-...v=7516fd43adaa
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