Need new .223 sizing die help. UPDATE

If it was me, I'd replace the mandrel.

I do generally keep plenty of spares.

And, I quit depriming with my sizing dies many years ago. I use a Lee decapping die now. They're cheap, and they work.

All I've got to worry about is stuck cases in the sizer die, and that does happen. But, now I don't bend the mandrel.
 
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