What caused this odd primer strike range brass?

[Kocher]

Sorting brass this morning, never seen a primer strike like this.

This was out of an unknown rifle as this is range brass.

Is this out of a hobbed out AR 15 that had years of abuse, causing a hobbed out firing pinhole?

The weird thing is that it’s a perfect oblong circle around the firing pin hole mark.

Does someone knows this a primer that comes that way? Looks like it was from 2018.

 

[whatsupdoc]

That is not from the rifle, the primer came that way.

 

[Kocher]

Okay…. Thank you for that info…. Wasn’t sure if it was a machine gun or from factory 1st time for everything!

Is that a burdenham (I know I’m not saying that right) primer? Will have to look and see if there a 2-flash holes… as that would have jacked up my press if I plug that through, unknowingly.

 

[OREGUN]

burdenham

Berdan