My wife has a Steyr Tactical elite, .223, 20" barrel 1/9" twist.
When we use 69gn Sierra Matchkings, and 25.5gns AA2520. At 100yards it's a one ragged hole group gun. Seriously, I won our club competition a couple of weeks ago with it, 10 5 shot groups, none over 1" big.
SMKs are however...