Your not trying to put small primers in the large primer tube are you?
I would empty your loading tubes and disassemble the primer tube on the press and look inside of them and make sure there's nothing that will interfear with the feeding.. Also take a good close look at the primers that are causing the problem.. It should be pretty easy to spot what's hanging up and causing problems.
Back when it was really difficult to get primers I bought some Wolf primers. Now have a Dillon 650. Is anyone else having trouble with them getting stuck in the primer magazine or filler tubes?
Added note: I'm a noob with the 650.
Yes, I am having problems too. Running cci small and switching over to wolf srp I have immediate problems on every other 100 pack. I had to buy two new primer tubes after they became completely lodged in place.
If I were to guess??, I would say that you may have just gotten a bad batch/lot.
My advice is worth what you paid for it..HA HA...Bill.