I got my 257 WBY brass from www.huntington.com
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<br> head stamp is 257 WBY, Norma brass.I think it was $68.00 US .
<br>But it is the same size as 270 WBY.
<br>270 Rem brass will work,Just a wrong head stamp.That is a lot cheaper.
<br>With the Norma I was getting loose primers at 4 to 5 fireing's.So it is a little soft.
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