Starline .38 Special brass used in Cowboy Action Shooting. I don't always get all of my brass back after a stage and sometimes I end up with someone elses brass.

Regardless, the loads are almost always minimum power/pressure.

While depriming/resizing, nothing felt amiss. Then the new primer wouldn't seat. Using a Dillon 550.

Ran the brass back into the die to pop the partially seated primer out and found this.





I was not able to pry out whatever is left.

Any ideas?