schmellba99 what is it you had to modify to the priming system?
Two things:
1) - I polished the primer shuttle and chase to smooth out some imperfections. This is an aluminum part, so it doesn't take much. Mine had a couple of little rough spots that seemed to bind up every now and again, so a dremel, 3 or 4 minutes and then a brush with some moly really smoothed out the operation.
2) - In my opinion, Hornady has a simple design flaw with their priming system (seems every manufacturer does). I will use the part numbers from their O&M Manual to keep things as uniform as I can and use the right nomenclature.
Part No. 14 - Housing Body Primer Tube (this is the part that bolts to Part No. 24 - Sub Plate)
Part No. 4/5 - Primer Tube (Large/Small)
Basically Part No. 14 bolts to the Part No. 24 and then holds the primer tubes (Parts No. 4/5). Each primer tube has a small shoulder machined on one end that sits inside of Part No. 14. You then fill the primer tube, screw on the blast shield and rock and roll. Sounds great in theory.
What I was experiencing is that, especially with a full primer tube (Part No. 4/5), the motion up and down of the entire assembly was creating just enough inertia and friction to eventually unseat the primer tube (Part No. 4/5) from the Housing Body Primer Tube (Part No. 14). What then would happen is that the primers would come out of their neat little stack and I'd end up with a hell of a jam in the system - and it only compounded itself when i'd unscrew the blast shield that was containing the primers. Primers everywhere, cuss words galore from schmellba99.
So I simplified the system by turning 2 parts into 1 - I ordered a new Part No. 14 (I have 2 of them now) and epoxied the large primer tube into one of them and the small primer tube into the other. The only real change is that when I change from large to small or vice versa, I now have to unscrew the entire assembly from the sub plate instead of just pulling the large or small tube out of Part No. 14. In all reality, it makes absolutely zero difference in the amount of time to change over from one to the other in my opinion. But now that the entire assembly is one unit, the tubes cannot back out of the housing and my primer system problems have all but disappeared.
The only thing I do now is what somebody above alluded to - keep the shuttle clean, which I always take a few seconds to do every 100 or so rounds (basically when it's time to add more primers - use a brush or a can of compressed air and clean any grit, carbon or powder kernels out of the entire shell plate and primer shuttle area).
Picture of the housing assembly and primer tube epoxied (I used simple JB Weld) together to make one unit instead of two pieces:
Picture of the primer tube and housing where it bolts to the sub plate. That single allen headed bolt (behind the blast shield - you can see part of it) is what needs to be removed and replaced when switching from one size primer to the other. Also shows the shuttle and chase area that I polished lightly and added some dry lube: