pretty much bog standard case head seperation I would say......someone tried to get two too many loads out of brass and forgot to use paper clip feeler guage to check for thin spot.... the very reason I partial length resize and not full resize each time...my poohseventy is very hard on brass if full length resized,it will do what yours did after half dozen loadings.
but IF its as said new brass....HORNADY NEED to be told about it.
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