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...
"I crapped my pants to avoid the draft!!" -Ted Nugent