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284 brass, Norma dimensions?

Can anyone tell me if the new Norma 284 brass is based on the 6.5/284 Norma head dimension or Winnie's 284 sammi chamber. Head dimension would be about .500 for Norma...Winchester is about .495

Trying to figure out if it will work in my chambers cut for lapua/Norma brass or if it will act just like my Winchester brass which by the way will be going up for sale soon.
 

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