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Old April 7, 2012, 06:59 PM   #26
Mike Irwin
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Join Date: April 13, 2000
Location: Northern Virginia
Posts: 41,374
"To me, the case appears to have been fired in an oversize chamber, or even a .222 Rem or Rem. Mag."

That kind of case fracture is not indicative of an oversized chamber, nor does there appear to be any case deformation.

A split from an oversized chamber also wouldn't look like an aerial map of the Mississippi River.

As I said, I've seen this numerous times in the past -- it's a flaw in the brass, either bad brass, an inclusion in the brass, or locked in stress that wasn't relieved during annealing.
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