The 5.56 RAR will shoot sub-MOA using 68-85 gr H BC bullets from 25-600 yards. 1"-1.2" 3 shot groups @ 500 yards on a good calm day. 5.56 provides better velocities out of the 16" barrel. For example: Sig Sauer 77 gr .223 vs Sig's 5.56, 2020 (.223) vs 2570 (5.56) FPS in velocity. Accuracy of the .223 round is still sub-MOA but @ extended ranges the .223 lacks accuracy as the BC is effected by lower FPS, hence the bullet is impacted by environmental conditions longer.
I like my ugly, noisy built like a tank 10 round darn at times precision RAR. Rides in my truck and is loaded with Barnes 85 gr or Sig Sauer 77 OTM 5.56 BTHP. The 55/62 gr BTHP or BT are great for 300 yards and in, Frontier/PMC/others fill this range. Higher BC hence weight covers me for close in > 600 yards.
A new comer for me @ a great price is AAC 75 gr, $12 a box. Palmetto makes these and the 77 gr @ $15. @ 500 yards 5 shots, 1" plate swung 3 time and twisted 1 time. Haven't put it on paper yet @ 500.
Norma Golden Target 77 gr is listed as .223 but it's not, it shows pressure signs in my .223 Savage 1:8 twist. FPS out of the RAR is = to all 5.56 77 gr pills tested and its very accurate, when on sale buy it, you won't be disappointed with 2525 FPS out a 16" runway.
Ensure free float, trigger to less than 1lbs and enjoy! Best inexpensive accurate rifle with factory ammo I have ever owned by far. One day Ms. Ugly (my RARs name) will get a used "Sister Ho" with a 20" varmint Shaw 5r barrel, 750-800 yards will be the goal. You can't go wrong with a stock RAR, it's that accurate and fun to shoot in any scenario and I'm a Savage/Bergara man!