I am new to the group and was not able to find any info already discussed that helped so I am reaching out for insight. I just started processing some 9 mm range brass and noticed some of the casings were significantly more difficult to deprime that others. At some points I was applying so much pressure the pin was backing out of the collar and eventually, after tightening the collar to hold the pin more firmly, I bent the the pin.
I am using a Lee single stage press with the universal depriming die. I realize the crimped casing could be more difficult, but I didn't think they would be this difficult - assuming that is my issue?? Any insight would be appreciated!