Head separation and dimpled case body

[Dans40X]

Gents,
If the OP,AreaMan doesn't have a handle on his sizing set up in 4 years, he shouldn't be reloading....anything !

 

[Dgd6mm]

What is the best process to fix the problem

What is the best process to fix the problem

Dan, I believe this fella revived it because he missed the cure.

 

[fguffey]

I honestly wish the die companys would provide a dvd to help people not induce dangerous head space issues.This has long been overlooked and should be addressed so beginners can actually understand how to start reloading safely.

The case does not have head space, and then there is the big problem. The reloader has no clue about the events that happen between pulling the trigger and the bullet leaving the barrel. I am told the shoulder on my case moves when I fire the round and when I size the case. I say it is impossible to move the shoulder of a case with a die that has case body support. SO?, if you are looking for an explanation you are going to have to find someone that understands why my shoulder does not move. Because? If my shoulder moves I started ripping my case when it fired.

F. Guffey

 

[fguffey]

This has long been overlooked and should be addressed so beginners can actually understand how to start reloading safely.

No, the problem lies with those that believe they know how to load. Their cases have head space and they 'bump' and they claim they can move the shoulder forward and back, in my opinion moving shoulders is a bad habit.

F. Guffey

 

[Comrade Terry]

No, the problem lies with those that believe they know how to load. Their cases have head space and they 'bump' and they claim they can move the shoulder forward and back, in my opinion moving shoulders is a bad habit.

F. Guffey

 

[yotehater]

Is winter over yet? My headspace is hurting.

 

[Curmudgeon]

I'd worry more about the ejector mark on the separated case.

 

[Dusty Stevens]

No, the problem lies with those that believe they know how to load. Their cases have head space and they 'bump' and they claim they can move the shoulder forward and back, in my opinion moving shoulders is a bad habit.

F. Guffey

Where you been man? You been MIA i was hoping you were still alive

 

[Dgd6mm]

You and the case become one in the chamber....that's how you know....

 

[fguffey]

One too many reloads on a batch of 300 Win Mags and had a case head separation.

So it is assumed all of this happened with the last firing. The dimples disappear when the pressure on the inside of the case is greater than the pressure on the outside. Dimples appear when gas is trapped between the chamber and cases, the first thing to seal is the neck of the case, slow burning powder and low pressure can prevent the case from sealing the chamber.
And then there is the extractor mark on the case head; the OP claims he has loaded the cases many times with only one extractor mark so someone is saying the extractor mark disappears ever time the case is fired, there has to be something about .7854 the reloader does not understand. My cases imprint on the face of the bolt, if there is a hole that is filled with a cylinder and if the bolt face is not smooth I get an imprint on the case head. Does anyone ever determine if the extractor is an 'innie' or an 'outtie', or is the bolt face smooth.

And then? Again, the OP said he has fired these cases many times, if the case has been fired many times the case head has been hammered many times and that work hardens the case head so I would suspect the extractor mark happened a few firing ago.

And no one measure case head diameters.

F. Guffey

 

[yotehater]

I'm having trouble seeing how the pressure escaping from the incipient head separation collapsed the shoulder. What I see is that the neck leaked gases back between the brass and chamber wall pressurizing the shoulder area while pressure was lower at the separation from the failure. Once the case body had sealed off the brass above the incipient area the gas pressure outside the case from neck blow-by collapsed the case due to lower pressure from the head separation venting off pressure inside the brass. How did the same pressure that was inside and outside the brass from the separation do that?