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Old April 7, 2012, 06:59 PM   #26
Mike Irwin
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"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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Old April 7, 2012, 09:59 PM   #27
Shotgun693
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I've never had brass split like that but about 33 years ago I opened a brand new box of WW .357 Mag ammo and found that in 5 of the rounds the bullet was upside down. Of the 45 rounds left of that box 5 rounds wouldn't fire at all. I always figured at a box of rejects some how got out of the factory by accident???
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Old April 8, 2012, 10:43 PM   #28
sc928porsche
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I had some Norma in 6.5 Jap do that. Headspace was ok, but chamber was oversize in diameter. I rechambered to 6.5x308. It was a rifle that dad picked up on the "Canal".
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