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Well from what I can tell the 257 Roberts is a very close match to the 308Win case, other than the rim which is a little narrower by .022. In my opinion the magazine will not be a problem. The bolt carrier will need a little attention but nothing that can't be remedied. On another note what will you be doing with your 358win barrel? I would be interested in it for the right price. Good luck with your conversion.
 
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