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Old January 11, 2013, 12:51 AM   #17
jmfc606
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Join Date: December 27, 2008
Location: Upstate NY
Posts: 97
The 257 Roberts is a 7x57 necked down to .25 cal and the .244/6mm Rem is a 7x57 necked down to 6mm. That's it, so yes you can neck down .257 brass if you had to. I didn't think there was a shortage of 6mm brass. I know Remington has an 80 grain factory load for the 6mm so that would be a good place to start for the non reloader.
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