I have issues with frontier brass. Loose primer pockets are the biggest complaint but when I’m shooting range brass it’s plinking ammo anyway so the flashholes don’t bother me. So far I’ve had good luck with GFL brass. Nice and tight primer pockets and they seem to be most of what I’ve seen in my range brass. I don’t toss any of it until I find major defects or they’ve run their course. I use LC for load development anyway.