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Old March 15, 2011, 06:26 PM   #19
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Join Date: May 27, 2007
Posts: 5,040
Well, first it is NOT a sensitive primer going off from the bolt hitting it. The primer shows a clear firing pin mark.
And how very wrong is the assumption that a slamfire round won't have a nice deep firing pin mark.

I had two out of battery slamfires in Garands, the second blew the receiver heel into my face. Both cases had nice deep firing pin marks. No primer cupping either.

I had one inbattery slamfire with a AR with the new brass finish WSR. The primer mark was indistinguishable from any other round I fired that day, no primer cupping.

And the second shooter on my firing point, he had a AR slamfire, with Federal match, and his primer looked like any fired primer. Nice deep primer mark. no primer cupping.

In a recent Rifle or Handloader magazine, Mike Venturino shows the back end of a 7.62 Russian slamfire case. Not a shallow primer mark, though on his rifle, there is some cupping.

I don't know why this is so, but it is so. Maybe someone can install a high speed camera in the bolt face and figure out the mystery.
If I'm not shooting, I'm reloading.
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