For the weatherby's your limited to Norma or Weatherby. But the Weatherby brass is made by Norma anyways. Expect 35 bucks for 20 brass.... or you can fireform 7mm Rem brass.... but the 7mm rem brass is a touch shorter than the weatherby..... 2.500 vs 2.549.
I don't know how much shooting you plan to do with it, but if you buy 2 or 3 boxes of 257 weatherby brass you should be set. I am on my 8th reload and have not yet had a single case fail yet.
Where is the best place to order brass from? What sort of brass would one order for the following calibres? 257 wby mag, 7mm wby mag, 7mm rem mag?