Lee collet neck sizer

[Wizbang]

I recently got a prefit barrel for my tikka chambered in 6.5 prc. With all my other rifles I reload for I use a Redding body die, then neck size with the Lee collet die. I really like this process as it produces little to no run out in my case necks as well as gives me consistent neck tension.
When I purchased a Lee collet die for my new 6.5 prc and put it to use, it completely effed up the first case I ran through. It’s hard to explain but it ended up bulging out the case shoulder. Like it pressed down on the neck and pushed the shoulder out. I thought I had set the die up wrong, but this is the 5th die like this I own. Lee calls for 20lbs of pressure for the collet to compress on the mandrel and form the case neck. I tried running it at way less pressure than 20lb. I don’t know where I went wrong?
This is with Peterson brass.

Anyone have any experience with this happening?

 

[Castle Rock]

I use a lot of lee collet dies, and like them a lot.
But I also have a process to tune them up a bit.
When I get one i disassemble them and give them a bit of a polish, deburr and lube.
Maybe the collet is jammed shut on the mandrel

 

[hiker270]

Collet may be jammed as stated before and I also claen up the internals on the die. Not impossible it's the wrong die even though it is packaged as 6.5PRC.

 

[Wizbang]

I use a lot of lee collet dies, and like them a lot.
But I also have a process to tune them up a bit.
When I get one i disassemble them and give them a bit of a polish, deburr and lube.
Maybe the collet is jammed shut on the mandrel

I take mine apart before first use and lube them up pretty good, but have never thought about polishing them up. The mandrel slides easily in and out of the collet.

 

[Wizbang]

Collet may be jammed as stated before and I also claen up the internals on the die. Not impossible it's the wrong die even though it is packaged as 6.5PRC.

It’s stamped 6.5 prc at the bottom of the die.

 

[jfk69]

Like others, I strip them, clean and lube them and clean up any burrs. I love them as well.