Even the best Manufacturers sometimes put out a dud . Lapua did that with 223 Brass a few years back when they subcontracted and there were reports of way off-center flash holes . Just recently I've seen at least one Report of Case separation when fired in an AR . Frankly , for Varmints , my Custom 223 does'nt see much Difference between Winchester , Remington , PMC , IMI , Honduran Stuff ( can't remember the stamp ) , and I can't remember what else . Just bought a lot of Lake City , but have'nt tested any yet . Maybe I've just been lucky .