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I'm having a somewhat similar chambering problem with a new .25-06. The cases necks are getting blown out in firing and using neck dies for resizing doesn't bump the shoulder back so the fired rounds will not rechamber. I've been using a Redding bump die to reposition the shoulder, then size the neck separately. When I read your post my impression was that might be your problem, blown out shoulders. Best wishes.
Cal - Montreal
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