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As to slamming the case back hard enough to cause brass extrusion, that would also be the case w/ over-sized (overly-shorten) high-pressure bottleneck cases like the 300WinMag/NormaMag which operate at 63,000. Doesn't happen.
Concentrate on timing.
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The deformation of the case rim towards the web in the area of the extractor has been quite consistent in the cases that show signs of incipient pressure issues--even while the primer appears perfectly normal.