Never fired before, very well lubed.
Bullets were slamming into the bottom of the barrel and jamming the bullet back into the casings.
One thing I noticed that was after clearing the jam, if I didn't slam back in the magazine, it seemed to work better.
I will try the ETS mags.
I thought I had read that OEM Glock was the best, but now hearing that they hate 33-round Glocks.