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Hope you have good luck with your search. I ended up with the other problem. A friend gave me a pile of 257 Roberts brass and loaded ammo so I ended up having to find a gun lol.
I too had a very hard time finding 257 Roberts brass (other than Nosler and I didn't really want to pay that much for brass - I think it was $130/50 rounds) so I converted 7mm Mauser brass to 257 Roberts by running them through the Roberts die. If necking up from 6mm you may thin the brass slightly. If you neckdown from 7mm Mauser, you may need to trim for length and/or neck turn (do a few and verify they still feed alright into your chamber).
I've also read on forums that 30-06 brass can be converted fairly easily too. This is an old thread with some recent activity that has a few 6mm, a few 7x57 and lots of 30-06 brass for sale: https://www.northwestfirearms.com/threads/brass-for-sale-9mm-40cal-223-and-more.381108/
You could reach out and see what's available if you want to try that route.
Three boxes of Winchester 257 Roberts +P Brass Purchased in 1983 $75 Will to ship add $12 USPS Priority PM me if you have any questions.
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