After 200/300 loads the primer system has not missed a lick. Did have trouble seating primers all the way a couple of days ago. Investigation showed that the shellholder plate had loosened, even with a lock washer installed. Added, check the shellholder plate to my preflight checklist.
Shell plate is a good thing to add to the checklist, I keep a allen wrench for that purpose next to my press now. The shell holder loosening is what caused mine to bind that time and when I forced it I broke the hub.