My 9 twist 223 shoots its best with the 73 grain Bergers,maybe it didn't get the memo that 9 twist is too slow.I've shot a very few number of good groups with it at 1,000 yards on very calm days.If a mouse farts in their direction way out there,they'll drift about 6 feet,lol.I shoot the Bergers,the tipped Matchkings and the regular Matchkings at 600 yards and they all do great.