So the sight in for the Savage 6mm CR.
is this a controlled round feed or push feed rifle?
Spring loaded inline bolt face ejectors push chambered rounds forward to headspace limits before firing.
Doesn't this happen with push feed systems anyway? The round is pushed into the chamber until it is stopped by the headspace limit, and then the extractor snaps over the rim. The spring tension of the ejector keeps the case from moving back any, so its not "tight" against the bolt face surface, until gas pressure pushes the case head back, AFTER the firing pin has impacted.
I can see a case being driven forward by firing pin impact (to the point where the inner face of the extractor claw contacts the forward face of the case rim IF it doesn't get stopped by the chamber headspace point before that, IN A MAUSER style controlled round feed action. Just don't see how it can happen in a push feed system.