Wolf brass-cased, Taiwan-produced, ammo is very good.
Avoid steel-cased ammo of any stripe in your 5.56 AR15-type autoloader.
If you handload, you can buy primed Wolf 5.56 brass. I shot my best score by far at 600 yards at Camp Perry this year using ammo I loaded on Wolf primed 5.56 brass. 24.4 grains Varget and an 80-grain Sierra Matchking. No additional brass-prep required. Dump powder. Stuff bullet. Shoot best 600-yard score of my life at Nationals. I shot high-master scores two days in a row at 600. I'd never shot a high master score at 600 at Camp Perry in the many years I've been going there. I'm a big fan of the Taiwanese brass.