It may be the primer- I generally use WW or Fed primers but a got some CCIs, which I haven't used in about 40 years. I went to prime some cases and the first two primers "flipped" in the priming ram and got deformed, making them useless. Back when I used CCI primers I recall having similar problems so it may be something about the primer, however I wanted to use the remaining primers so looked around for some means of "priming" the cases. I got out an old Lyman 310 tool kit and screwed in the priming die. Worked like a charm. I doubt that I'll use the press mounted primer arm- the 310 is easier to use and provides clear vision of the process as well as "feel". Photographs of the squashed primers, RCBS frame mounted primer arm and Lyman 310 tool.
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