Base came off during sizing

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The head of a new case isn't "the perfect size" to push out the old case. 9mm is a tapered round with a bigger case head/rim than the rest of the case. Good luck with that.

You can force the case head of a 40/45 case through a LEE FCD with a ram. But that's not going to fly with a 9mm. And the sizing die is smaller than the FCD.

You might try a .380 case, at least. Even there, I bet it's going to be too big. You might get two things stuck in the die. If just the case wall has enough spring to get stuck, imagine stuffing a solid case head in there.
 
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If your still working on this: I would use another case to push it through. A 38Spl would be helpful & I would lube it. The 38Spl has a nice lip to pull back down.
 
IMHO the best advice is to contact the die manufacturer.
Most likely they'll have you send the die in & they'll fix it.

If it's a Lee die, they charge $4.
Any other brand, most likely they'll fix it for free.
 
Just set your flairing die to make the mouth of another case the proper size and use it to press it on thru. If it doesnt work a plug of JB WELD overnite will give you something solid to pound on.
T
 
If the rim pulled out of the shell holder, this is because lee sends a #19 shell holder with their 9mm dies, which is the same holder that the .40 uses. Obviously there is a difference in rim diameters there. That holder barely grabs the rim of the 9mm and if the case gets a little stuck, it will rip past the rim when trying to pull it out. If the entire base of the case actually pulled off, that's nuts. Some of the advice given may help with that. I've never seen that, and can barely imagine how that could happen without ripping the rim first.
 
push-pull, I make pullers, I make pushers, not familiar to a reloader is a tool called ‘slide hammer’ it is in the puller family, then there is the tap/thread method, screw something into the case then drive it out from the other side, and we all know it is important to protect the integrity of the die.

F. Guffey
 
Had a .40 federal (marked FC) case head come off while shooting a while back. Came off just like your pic. Fed had a problem with .40, don't know about a problem with 9mm.
 
Took a triangle file to the case and made 3 seperate cuts in the case, then took a screwdriver and hammered the 3 sections toward the middle. Put the die in my single station press put a dowel rod down the die and hammered the dowel rod and stuck case popped out. Thanks for the suggestion.
 
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