I've got over 3000 rounds (lost count but it's probably around 3,500rds) through my XD9sc without issue...until today. I put another 100 rounds through it today, 124gr WWB and about half-way through, I put 8 or so rounds in a magazine and on the 3rd or so round, I pulled the trigger and it just went click. I ejected the round and kept firing without issue. I picked up the round and it looked like the striker barely dented the shell. The other casings all were solid dents...so I put the round back in and it fired without issue. So gun/striker or a hard primer?? That one round was the only issue today.