[Decapping issues - 9mm with Lee Universal Decapping Die]

Thank you for all the insight.  What I am hearing is what I was thinking.  Just wanted to make sure I wasn't crazy or missing something.  I started just setting aside the more difficult casings and will address them later.

[Decapping issues - 9mm with Lee Universal Decapping Die]

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!