Gas blowback ?

[bruce381]

one last thing cases work harden with use and over time get hard and wil not flex or seal as a softer new one will

[fguffey]

one last thing cases work harden with use and over time get hard and wil not flex or seal as a softer new one will

Nothing like starting over a-new ever day; it would interesting to determine how much effort is required to expand the neck of a case that has been work-hardened, I have strain gages and I have little bitty neck espander ball ball assembles, I do not believe my press will handle 40.000 +psi, I can not imagine what it would take to get a case out of a die after being exposed to that kind of abuse.

And then we have all of these reloaders that claim they fire the cases over and over until the necks split. So someone should ask: What is it? Does the case harden or does it get brittle?

My cases must be exempt or immune because my cases get brittle and they have been know to work harden, but I believe there is a little confusion about work hardening. The more I shoot my cases the more I have to alter my attitude toward my brass.

F. Guffey

[sofbak]

Yes the case hardens. Yes it gets brittle. The metallurgical principle is called fatigue/stress fracture. Educate yourself here:

https://accendoreliability.com/metal-fatigue-failure/

[RestrictedColt]

I get some neck soot on most loads, mine or factory.

[RestrictedColt]

I get some neck soot on most loads, mine or factory.


And kudos to all of you for ignoring the troll.

[smoothy8500]

The Guffster? Yeah, it's routine. He gets automatic alerts whenever the keywords "headspace" or "neck tension" are typed in a forum.

[RestrictedColt]

Pretty interesting theory, except I don't think either term was used before he chimed in.

[divingin]

I do not believe my press will handle 40.000 +psi, I can not imagine what it would take to get a case out of a die after being exposed to that kind of abuse.

I'm guessing 41 + psi.

[sofbak]

Wait. Is it 41 + psi or 41 + tensions?

[pacrat]

Wait. Is it 41 + psi or 41 + tensions?

That determination can easily be made with a "psi/tensions" feeler gage.