No damage. But there has been a few times I have been worried I am going to rip the case head off trying to get expander ball back through the neck. I took the expander ball out and found that it excessively resizes the neck. Seating a projectile in such a case was difficult and the projectile bulged the neck out. I think they size way to aggressively and the expander has to do alot of work to open the neck back up. With my redding dies I just screw the expander button off and run the case through without it with great results.
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