This is so typical. Bashing Lee or the Loadmaster is not so High Road. The Loadmaster priming mechanism is maybe the weaker of the shell stations but as has been stated before, setting it up correctly per instructions and maybe using a second re-sizing die to assure that the shell is held exactly in the correct position will result in no problems. After destroying one little plastic thingy (primer mover), which a call to Lee resulted in free replacements for the SP and LP, I have not had it happen again after nearly 8000 rounds without using the second re-sizing die. My next reloading session will likely be with a re-sizing die in the second station and let the Lee Auto Disk flare the case in the third station. But, follow the instructions, watch the videos, don't try to set a speed record and you will not have any problems. Also, I use any primer that I can buy, including Federal. Use common sense safety procedures and even without the blast/lawyer shield you will be safe.
Objective feedback is not product bashing.
I had two Loadmasters, one setup for small pistol and one for large. It was very seldom that I could get through a session of 200 rounds without hiccups on the primer feed, with large or small pistol primers. With a placeholder die over the priming station.
The detonations on the press that I experienced I can count on one hand, over thousands of reloaded rounds. A small number , but one is one too many. More often, I would get primers seated upside-down, and sideways.
I kept those presses for years, thinking that I was doing something wrong, and that eventually I'd get it working properly.
Eventually, to save wear and tear on my nerves, I hand-primed, then used the press.
If Lee could fit the Loadmaster with their turret press primer feed, it would improve the product.
I did everything possible to resolve the primer feed problem, including removing the factory burrs and ridges from the primer chute with very fine emery paper. Eventually, I gave up and sold the presses.
Every other aspect on the press worked well, the case feeding, powder drop and shellplate indexing. Just the priming system on the Loadmaster is a general design failure.