Hello,

I wish that I could provide the answer to your problem.

It's very strange, I have loaded many, many thousands of rounds using CCI primers, 100% for 0.223", a RCBS primer pocket tool and a very old Lee primer "loader", and I have never had a problem like yours.

Perhaps try a new pocket cleaner and another batch of CCI primers.

When you are loading the primer do you find it unduly difficult to insert the primer, pressure wise?

Good luck with solving the problem.