I really believe people are over thinking this whole problem. When Wellington Sporting Arms first brought these rifles into NZ only berdan primed ammo was available and we sized down 30/06 and 270 cases which worked well in spite of an undersized head. My old RCBS dies turned out ammo which could be fired in several rifles interchangeably with out a problem. In Military rifles headspace is often loose and not a problem.Annealing cases was not common practice and we just fired them till the neck split.
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