I had that happen to nearly 50 out of a bandolier of 50 wartime mk7 .303 headstamped GB or something, someone at the range told me that was a UK manufacturer. The particular SMLE implicated was my one with the most generous/excess (a matter of viewpoint) shoulder space. Anyway those two planets, "Brittle" and "Stretchy" aligned for split shoulders and necks to occur.
That said, the bullets all flew nicely downrange as intended apart from frequent clickbangs, and the brass was Berdan primed anyway, so as long as no case separations it was just another day at the range... (-:
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