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Old December 4, 2012, 02:44 PM   #19
mehavey
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Join Date: June 17, 2010
Location: Virginia
Posts: 2,779
The only thing I can think of is that the cases are separating at the juncture of where annealing stops and stiffer brass starts -- i.e., a materials/stress transition point.

Normally I'd expect the effect to be graduated down the case body. But maybe not. (I could envision induction heating as producing such a sharp transition).

Is there a possibility of your annealing a dozen cases/extended shoulders "the traditional way", and then tracking their failure rate compared to the others?
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