Case blew up during rapid fire. Help me!

[Ken6PPC]

23 minutes ago, drewbeck said:

Not to totally contradict but just spray some gun oil, wd40, or other lubricant in it to soak outside the case and use a brush, pick, tweezers, etc to remove.

 

the case expanded and wedged itself inside the chamber during firing but cools and shrinks after firing.  It happens every time you fire a round, you’re just missing the rim and extractor now.  There’s carbon that’s making it sticky 

 

Freezing works because brass contracts more in cold temperatures than steel.  If there is carbon holding the case, freezing will reduce the friction, because the difference of diameter between the chamber and the brass will increase the colder it gets.  So, the case gets easier to remove.  

 

Also, I'd try it dry first, because it is easier to apply lubricant than to remove it.  If dry doesn't work, then try lubricant.  

 

Basically, both of our methods are just different approaches.  Neither is WRONG, just different...  

 

[Schultz77]

5 minutes ago, superdude said:

A picture or two would be useful if you can swing it. 

This is all I have cousin lost the other piece. 

[echotango]

That is stepped brass

[Sarge]

4 minutes ago, echotango said:

That is stepped brass

Yep. Perfect example

[Schultz77]

Thanks guys I had never heard of a stepped case before I am definitely on the look out now.

[AHI]

push a 40 cal brush in from the muzzle it will most likely come out .

[AdamM]

Actually you usually can see a ring on the outside of stepped brass. Perhaps not always, but more often than not. I always inspect brass before reloading and can almost always recognize stepped brass before reading the headstamp.

[36873687]

Max tech/FM/ ammoload/ an IMT are your head stamps for step brass. An some max tech are not stepped 

[drewbeck]

 
Freezing works because brass contracts more in cold temperatures than steel.  If there is carbon holding the case, freezing will reduce the friction, because the difference of diameter between the chamber and the brass will increase the colder it gets.  So, the case gets easier to remove.  
 
Also, I'd try it dry first, because it is easier to apply lubricant than to remove it.  If dry doesn't work, then try lubricant.  
 
Basically, both of our methods are just different approaches.  Neither is WRONG, just different...  
 

Ya, I understand your logic, but the case was always undersized and wasn’t a press fit into the chamber to begin with. Your talking about the coefficient of thermal expansion which wouldn’t be applicable unless the chamber had enough pressure to expand more than the case to begin with and then constrict on the case due to differential pressures.

In something like a Jacobs or Morse taper, this is an entirely different situation than a thin piece of brass in a relatively thick walled piece of steel.

Just my opinion


Sent from my iPhone using Tapatalk

[jmtyndall]

14 hours ago, Schultz77 said:

This is all I have cousin lost the other piece. 

Can't see the step from the picture, but it certainly looks like the case broke right where the step would have been. Which makes sense because it's where the thick part of the case meets the thin part and there would be a stress concentration at that corner. I believe that will have been a piece of stepped brass.

 

Next time try to find and keep everything so that you can properly diagnose the issue.

[Silver_Surfer]

15 hours ago, AHI said:

push a 40 cal brush in from the muzzle it will most likely come out .

Or a bore snake. 

[GhostDog]

Happened to me once. A 2mm ring of brass stuck in the chamber.

Removed it with a sharp metal dental pick, wasn’t too difficult.

Be careful not to scratch anything.

 

Brushes, slugging and freezing did not work.

Edited April 8, 2019 by GhostDog
Typo

[Tawadc95]

Can you all explain why stepped brass is:

 

1. Made in the first place

2. What is the purpose of the step

3.Why factory loads work with stepped cases

4. Why do occasional hand loads have a problem with stepped cases

 

I have been loading 45acp for 30 years but am fairly new to 9mm and just this past year have seen my first step cases from gathering brass after a class

 

thanks

 

[36873687]

17 minutes ago, Tawadc95 said:

Can you all explain why stepped brass is:

 

1. Made in the first place

2. What is the purpose of the step

3.Why factory loads work with stepped cases

4. Why do occasional hand loads have a problem with stepped cases

 

I have been loading 45acp for 30 years but am fairly new to 9mm and just this past year have seen my first step cases from gathering brass after a class

 

thanks

 

I was told from good source that even ask FM that question. They save money on powder. Less charge to push. I’ve seen them stuck in few open guns at 9 major pushing 1400 FPS. It happens with pcc with long barrels. I’ve never seen it in minor load like your but it could have been stressed before u loaded it

[Tawadc95]

So, it is a reduce capacity case therefore probably easily over pressure at higher end loading book loads which were developed with straight walled cases most likely, the step appears to join the case wall at a 90 degree angle producing a nice sheer line.

 

I've been tossing some and loading some...I use 115lrn Blue Bullet with 4.3gn of 231.

Sounds like a good practice to toss them all.

 

Interesting!

[echotango]

It is a cheaper manuf process from what I was told. 

[Steve RA]

Save them, along with fired primers, both bring same price at scrap dealers.

[Miranda]

reduced capacity case... yer kiddin'...

 

any way to convince them to skip the step?

if they just tapered the case to have a thicker wall at the bottom

the volume would be reduced without creating a case with a built in stress riser. 

I would think that a super case for feeding any of the less supported chambers.

I avoid buying ammo I know has stepped cases because I do not trust it.

 

miranda

 

 

 

 

[Acer2428]

I always thought it was to prevent extreme bullet setback.... but it causes a ton of other issues in the process.

 

My powder cop die does a good job of catching these if I don't w/ 3.5gr of Clays, but might miss it w/ 3.2 of TG. 

[ezra650]

This is why I plan to buy processed and head stamp sorted brass when I start loading 9major. It's very easy to miss unless you pick up each case and look inside of it.

[echotango]

An M die and some powder dies may pick up the one on the right, but not the one on the left. I'm working on a die that will in the primer location of a 1050. 

 

[36873687]

56 minutes ago, ezra650 said:

This is why I plan to buy processed and head stamp sorted brass when I start loading 9major. It's very easy to miss unless you pick up each case and look inside of it.

It’s easy use hundo case gage. Then look over head stamps. 

[36873687]

17 minutes ago, echotango said:

An M die and some powder dies may pick up the one on the right, but not the one on the left. I'm working on a die that will in the primer location of a 1050. 

 

that will pick up the one on the right. Does m die pick up the smaller step fm ammoload?

[echotango]

28 minutes ago, 36873687 said:

that will pick up the one on the right. Does m die pick up the smaller step fm ammoload?

It does not.  It stops hard on the big step but the small step is a lot more popular and harder to spot.  I got an everglades primer hold down die but is barely misses the step. I am going out today to see what kind of sleeve or something I can get for it. 

[36873687]

11 minutes ago, echotango said:

It does not.  It stops hard on the big step but the small step is a lot more popular and harder to spot.  I got an everglades primer hold down die but is barely misses the step. I am going out today to see what kind of sleeve or something I can get for it. 

Let me know I also have Everglades hold down.