My Dillon SDB sometimes flips the primer over as the primer rammer passes through the shell plate, catches on the edge, and snaps in place. I v-e-r-y- s-l-o-w-l-y run the cases through the depriming station as I cringe, squint, grit my teeth and wait for the POP! So far and about 50 times later, no detonations. I separate those primers out and reuse them up in monthly practice matches or for plinking rounds.