Noxx,
Are you using the plastic "primer height" rod that rests on the primer stack, and that sets off the low primer alarm ? Although it's function is to set off the alarm when the primers get low, it also helps positive feeding if there are any slight hangups that occur in the tube itself.
Many times when the primers get low, they'll hang up slightly due to not only the lack of weight, but other reasons as well.
One reason (I recently found out) was due to the inside of the primer housing tube being aluminum, it will oxidize.
Even though I clean my machine a couple times a year, I never really considered to clean my primer tube. I'd blow it out with compressed air, but that was about it.....and apparently not enough.
Apparently there was a reaction between the aluminum and the primer dust the primers give off, and it eventually oxidized the aluminum to the point that it jammed up the primers.
I had the machine set up for .38 wadcutters, and I had loaded so many that I was overly supplied. I keep the machine set for just that one load, so it sat idle for several months.
Apparently that was all the time it needed to create the problem.
A call to Dillon, and admitting that it was my fault for not checking it, they still sent me another primer system for free.
The rep. laughingly said "well, the primer system has been updated anyway".
Now I run a properly sized bore mop down the tube, and using a toothbrush, I brush out the primer feed ramp at the base to remove the dust that builds up.
I also took that old corroded tube (which wasn't all that bad really) and with several patches of "Mother's" Mag Wheel polish, I polished it up nice & brite. It turned out so nice, I did the new primer tube as well. It polishes it to a chrome like finish and helps in the ease of feeding.
A light coating of industrial graphite down the tube also helps.
Live & learn.......I did.....
Take care,
Bob