My priming system seemed to have a couple of consistent issues:
1. The seating ram would get crud built up under it. That was a function of the design. If you were to take a section view of the ram system, the ram itself was shaped like a "T" - great for saving material (keep in mind that Hornady is producing thousands and thousands of these things, so over the long haul less material equates to cost savings). The drawback is that carbon, powder, etc. would get caught between the bottom side of the "T" shaped ram and the lip of the spring loaded housing. Hornady came out with a new design that is an "I" shaped ram that doesn't have the lip. Made a huge difference.
2. I polished the shuttle chase on the shell plate holder and the bottom of the shuttle slide, then added some moly dry lube (graphite works just as well - I just happened to have had some moly handy at the time). It's aluminum, so go easy - but polishing it up made it run a lot smoother. A simple 5 minute job that helps with the overall function of the system.
3. This is probably the biggest change that made a difference for me:
(I will use the part number and names from the LnL AP O&M manual to keep things consistent here)
Part No. 4/5 - this is the small/large primer tube that actually sits inside the Housing Tube Primer (Part No. 6). It has a little machined shelf on the bottom that allows it to sit inside Part No. 14 (Housing Body Primer Tube).
I had major issues with Part No. 4/5 physically coming out of Part No. 14 during the operation of the press - this led to the primer stack not being contained within Part No. 4/5 and subsequently falling all over the place. Made a huge mess. Only thing I can think that happened is that the constant up and down motion of the ram, combined with the ever so slight friction between the primer stack and the tube, would cause Part No. 4/5 to eventually wiggle its way out of the machined shoulder on Part No. 14.
So I went out and bought a couple more each of Part No. 14 and epoxied them together. So instead of 3 parts (Part No. 14, Part No 4 and Part No 5), I have 2 parts (I hope this makes sense - see picture below). Basically I have a single assembly for small primers, and a single assembly for large primers. The only change whenever I switch over is that instead of changing just the tube that holds the primer stack, I change out the entire assembly that screws down to the shell plate. And since then, I have had exactly zero issues with the primer system so long as I take a few seconds every time I refill a primer tube and brush off any loose carbon or powder.
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Changing from small primers to large is simple - change out the seater ram, unscrew the large housing, unscrew the allen headed bolt that holds the assembly to the sub plate, remove the entire assembly of small primer tube and housing that I've epoxied together, screw down the assembly of large tube and housing that I've epoxied together, screw the large housing back on, connect the spring and rock and roll. Takes all of about 3 minutes.