Some years ago I had a serious hang fire with Federal 357 SIG ammo. Probably 5 seconds. That really shook me up. I'd just finished doing tap-rack-bang drills with a friend and if it had happened then I might have been hurt. The rest of the box was fine.

I've had a few hard primers that required a double strike and a couple of dead rounds, mostly with cheap imported ammo or cheap stuff like Blazer. Use top of the line stuff for defense.

Old milsurp is a different story and only a fool would use that in a carry gun.

Steve