Punctured Primers w/ Factory Ammo?

DirtyHarold · April 14, 2022, 06:01 PM

While inspecting some of my brass from my recent chronograph outings I noticed that some of the primers were punctured. Only happened with the Hornady ammo, at least one critical defense and the others American Gunner. Has anyone else experienced this? The firing pin also looks like it has a little cavity in it. It’s definitely not “sharp”.

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Hammerhead · April 14, 2022, 08:27 PM

I had a 1911 that would pierce primers with hot cor bon ammo, but no others.
My Glock shot the cor bon with no problems.

reynolds357 · April 14, 2022, 09:46 PM

Quote:

Originally Posted by DirtyHarold

While inspecting some of my brass from my recent chronograph outings I noticed that some of the primers were punctured. Only happened with the Hornady ammo, at least one critical defense and the others American Gunner. Has anyone else experienced this? The firing pin also looks like it has a little cavity in it. It’s definitely not “sharp”.

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The firing pin is being burnt by gas coming through pierced primers. You don't have to pierce many to start to see breech face erosion.
As to why primers piercing, it has to be pressure. I believe Hornady uses Federal Primers. Definitely not the hardest, but up to SAAMI pressure no doubt.

DT Guy · April 15, 2022, 06:39 AM

And once that firing pin is deformed like that, it's all the more likely to pierce more primers. I'd swap that out ASAP.

Is the gun stock, or are the springs/guide rod/other stuff changed from OEM?

Larry

Reloadron · April 15, 2022, 10:32 AM

Quote:

The firing pin also looks like it has a little cavity in it. It’s definitely not “sharp”.

A result of the pierced primer. The rest of the primer appears flat as it should. Strange only Hornady ammunition but I would look at the firing pin protrusion. While not sharp you want to look at it real close because if that continues it will get worse with each round fired. If you have more of that ammunition unfired try looking at several and note the primer seating depth. Do they look normal compared to other .357 Mag cartridges?

Ron

April 14, 2022, 06:01 PM	#1
DirtyHarold Senior Member Join Date: July 23, 2015 Posts: 158	Punctured Primers w/ Factory Ammo? While inspecting some of my brass from my recent chronograph outings I noticed that some of the primers were punctured. Only happened with the Hornady ammo, at least one critical defense and the others American Gunner. Has anyone else experienced this? The firing pin also looks like it has a little cavity in it. It’s definitely not “sharp”. Sent from my iPhone using Tapatalk

April 15, 2022, 06:39 AM	#4
DT Guy Senior Member Join Date: February 4, 2001 Posts: 959	And once that firing pin is deformed like that, it's all the more likely to pierce more primers. I'd swap that out ASAP. Is the gun stock, or are the springs/guide rod/other stuff changed from OEM? Larry __________________ He who fights and runs away had better run pretty damn fast. Government, Anarchy and Chaos

April 14, 2022, 08:27 PM	#2
Hammerhead Senior Member Join Date: May 31, 2004 Location: Minnesota Posts: 2,432	I had a 1911 that would pierce primers with hot cor bon ammo, but no others. My Glock shot the cor bon with no problems.