Mickey...Yes feel your cases may be suffering metal fatigue, those plated cases look good but have thinner brass due to the dinky silver "Lone Ranger" platings. I would discard them ALL immediately and get a few 100 more Star all-brass new ones.. but only if accuracy is your thing, as a neck split (especially on WC and SWC lead target loads) is bad medicine for good groups in my tests.
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***Big Bunny***
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