Dillon in the past has advised against using CCI primers in the priming systems, since some of them are bigger than others. I believe CCIs have improved, but there is not an easy way to know which ones you have.
You really need to make sure that you have the priming seater and the little case seater arm adjusted(the little stainless bent arm spring loaded thingy that adjusts with an allen screw) is adjusted for the round you are loading. This gave me fits until I called Dillon(god bless them) and we worked on it over the phone.
A LOT of people have been having problems with the "new" gold WIN primers, the silver ones worked great for me. I really only load federals anymore for my revos, and WIN for autos on my 1050, Got a chance to trade up my 650. Try different primers after you get it set up properly with Dillon's assistance and see which primer works for you. Good luck, DC
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front sight is good, front sight is good!