Wasn't it the 6.5 Lapua brass? I've had the same thing happen with new 6.5 CM and .300 Win Mag brass from Lapua over the last year or so with new cases. I wrote it off as a fluke as the phenomenon didn't repeat itself upon a second loading. Lapua does make strong, thick cases.
I hope we kept them sorted off. I was going to toss them, but now I'm curious to run them again.
I have the Lapua brass running too, and a bunch of Hornady. (we shoot a lot of 6.5 lately) But this FC brass was just given to me by a guy who only shoots factory stuff and doesn't reload.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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