ive seen no flash hole with remington and winchester new unloaded brass.
since i dont buy much if any ammo off the shelf other than premium handgun SD ammo and 22lr ive never had a issue with off the shelf 5.56 ammo only with an extremely rare out of round prime pocket or out of round flash hole or non existant flash hole.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...