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Surprise while comparing some 223 die sets. How to remove a case neck from a die?

Got out a standard RCBS die set, a Hornady New Dimension Custom die set, and a Dillon carbide die set. Got out a set of plug gages and an expanding ball gage and wanted to see how much more sizing a supposedly "small base" Dillon set was. The Dillon set base diameter was the same as the RCBS, the Hornady was about .002 smaller.

While miking the die neck diameter, I found a broken off neck in the Hornady set. Tried getting it out with a punch and by attempting to screw a tap into the neck and driving it out. No luck yet. I'm going to make a bushing splitting type of punch out of a section of brass rod next. May have to polish it out.
 
They sell brass punches at Home Depot.

Brass Drift Punch Set (5-Piece)

Below are Forster die types, but nothing is written in stone, I have a Lee .223 die that will size the case body smaller in diameter than my RCBS small base die.
https://www.homedepot.com/p/Mayhew-Brass-Drift-Punch-Set-5-Piece-67003/301205814

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Are Your Sizing Dies Overworking Your Rifle Brass?
http://www.massreloading.com/dies_overworking_brass.html

Table 2 - Inside Diameter Measurements for 5 different sizing dies
overworked_table2.jpg

 
I’ve had the broken neck problem.
Unscrew the the decapping expander rod and insert in the top of the die.
Tap with a plastic or wood mallet.
The expander ball will push it right out.
 
Put the die in the freezer for a few days then try to tap out the broken case neck. Sometimes the cold will cause the 2 different metals to contract at different rates.
 
IF you have a drill index set, take the appropriate drill and grind the butt end of the drill flat to remove any chamfer, and use that as a punch to drift out the broken neck.

Or use several progressively larger drills to gradually drill the brass until it's a thin shell, and then tap out. I have used that method for when a case gets stuck and the head rips off in the die.
 
IF you have a drill index set, take the appropriate drill and grind the butt end of the drill flat to remove any chamfer, and use that as a punch to drift out the broken neck.

Or use several progressively larger drills to gradually drill the brass until it's a thin shell, and then tap out. I have used that method for when a case gets stuck and the head rips off in the die.

We think alike. I tried grinding the shank end of a drill and driving it out. A #2 is .223, and it just broached the brass in the die. A #1 is .228 and was too big to smoothly enter the neck without risking marring the die.
 

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