What would cause this

[Kracken McGraw]

You dont see the ole flattened firing pin dent and the smashed headstamps with ejector marks very often. That load takes the cake for being the hottest one on here in quite a few months. Could be oil in chamber but the pressure was astronomical

+1^^. If that pic is as OP states of re-sized brass of original load with a new primer, I sure wouldn’t fire anymore of the original loads or reload that brass either. Looks like dangerous pressure that flat pancaked the head of that brass.

 

[WEL]

As stated above their are known issues with the prc dies and chamber that can show up after several firings. The dies are not sizing the base enough. Also if I remeber correctly some guys were having issues similar with the CA rifles.

 

[Ccrider]

You dont see the ole flattened firing pin dent and the smashed headstamps with ejector marks very often. That load takes the cake for being the hottest one on here in quite a few months. Could be oil in chamber but the pressure was astronomical

When I looked at the photo, this was my first thought. Way over pressure.

 

[Tokay444]

From the OP: “I put a resized case and primer no powder or bullet in the chamber and the bolt is really stiff.”

Must be some hot primers.

Right, so that case was already subject to some extreme pressure when it was fired.

 

[Buzz]

Right, so that case was already subject to some extreme pressure when it was fired.

That’s your assumption. It may or may not be true. Knowing the sizing issues many are having with the PRC cases, it’s also possible the markings on the case head are caused by the sizing issue. Regardless, people are pointing to an unfired primer as proof of a pressure issue, which doesn’t make much sense.

 

[Tokay444]

That’s your assumption. It may or may not be true. Knowing the sizing issues many are having with the PRC cases, it’s also possible the markings on the case head are caused by the sizing issue. Regardless, people are pointing to an unfired primer as proof of a pressure issue, which doesn’t make much sense.

We’re pointing at the ejector marks on the case head as proof of a pressure issue.

 

[Buzz]

We’re pointing at the ejector marks on the case head as proof of a pressure issue.

You’re apparently only reading half the thread then, and my response that you quoted was to someone claiming the primer had been blown back flat due to pressure.

I agree the markings COULD be caused by pressure, and if this was a 6BR I would tend to agree with your ASSumption based on the picture alone, but saying ejector marks are “proof” of pressure means there’s no other plausible explanation for the marks, which is false. For the 8th time, there are numerous, documented sizing issues with this cartridge, and another possible explanation is that the bolt is being forced closed on what is a very oversized piece of brass. That would also align with the OP saying that the bolt was closing hard on a “sized”, unfired piece of brass. Jumping to conclusions that he’s over pressure without even knowing what his load is not helpful and potentially dangerous if there are other issues going on.

 

[Ccrider]

another possible explanation is that the bolt is being forced closed on what is a very oversized piece of brass. That would also align with the OP saying that the bolt was closing hard on a “sized”, unfired piece of brass.

If the bolt face is digging in enough to cause those marks because the brass is oversize, that sounds dangerous to fire. Either way, ejector swipe or too large brass, I would take the gun to my smith and ask him to figure out what is going on.
Jamming an oversized piece of brass into a chamber and firing it does not sound like a good idea.

 

[Buzz]

If the bolt face is digging in enough to cause those marks because the brass is oversize, that sounds dangerous to fire. Either way, ejector swipe or too large brass, I would take the gun to my smith and ask him to figure out what is going on.
Jamming an oversized piece of brass into a chamber and firing it does not sound like a good idea.

100% agree. Dropping a couple grains because you’re convinced the load is too hot and continuing to fire is a recipe for a bad day.

 

[shoot4fun]

If the bolt face is digging in enough to cause those marks because the brass is oversize, that sounds dangerous to fire. Either way, ejector swipe or too large brass, I would take the gun to my smith and ask him to figure out what is going on.
Jamming an oversized piece of brass into a chamber and firing it does not sound like a good idea.

100% agree. Dropping a couple grains because you’re convinced the load is too hot and continuing to fire is a recipe for a bad day.

Has anyone else noticed what is maybe the most important aspect of this whole situation?
The OP posted originally last Friday. He has not answered, questioned or in any other way acknowledged anything posted in reply. He was logged into the forum as late as mid-morning today but still we have crickets on his thread from him. In the meantime certain folks seem to be all wadded up about something that really we don't have a freak'n clue about cuz the OP doesn't seem to want anything but to sit back and let folks get all steamed at each other.
HOLY S**T

 

[buzzyb]

Ok I think I have it figured out. I bumped shoulder back to .003 and I uniformed primer pockets went and shot today and things went good, thanks so much for all the help.

 

[olddav]

Too cool