Strange primer indent

[Graham]

Anyone seen this kind of thing before? It's a fired case.

 

[Rprecision]

I got nothing,

I was going to guess high pressure untill I looked at the edges of the primer and the case head. I dont think that is the cause

Maybe a pronlem with the cup or a light strike ?

 

[Graham]

Strange primer indent

I've pierced many primers with that pin, but all the other cases, before and after, came out looking normal.

 

[Tailhunter]

Looks like cratering, a sign of over pressure.

 

[damoncali]

I'm guessing it's an "almost pierced". Looks like it pushed back and is just about to shear off. Just a guess, though.

 

[bigedp51]

It looks like the primer tried to flow back into the firing pin hole.

 

[DocB]

Graham,

Primer pockets uniformed? Checked for minimum load? Does it do the same thing with a different/stronger primer? Might be delayed ignition. Seen similar with primer pockets uniformed too deeply.

HTH,
DocB

 

[woostri]

It looks like the primer tried to flow back into the firing pin hole.

Yep. Seen that when the hole for the firing pin is too big. Not too uncommon on older guns.

--- aim small miss small ---