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However, there's really no purpose to hardening case heads.
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My opinion: the difference between case head separation and catastrophic failure depends on the case head staying together as in being allowed to stretch, crush and or expand. I am the fan of case head expansion; and then? the reloader must be able to measure the expansion. Before all reloaders became experts .00025 case head expansion was a good number. Reloaders that wanted to repeat the text could not continue using the same case because the case head would hardened from being hammered against the bolt face.
F. Guffey