Well, I put 100 primers in the tray, jiggle them around a bit till they're all pointed face down, invert and put about half of them in a pick up tube. Place the tube over the resovoir, pull the pin, and gravity pulls them down. Most of the time. When they get lodged, thats when I break out the specs, gauntlet, mallet, skewer, and vaccum cleaner.
Sometimes they get lodged in the primer feed mechanism. That requires interuption of the cycle and the start of the fun and games associated with shell plate removal.
salty