For longer range (100 and up), I have a few that are set up for different calibers.
In 5.56/.223, with a 20" barrel, 1:8 twist, using 69-75gr ammo, and with a scope, it's pretty easy to keep MOA out to 200 yards, and on a good day, push it out to 300 yds. If I put on the 24" upper, 1:8 twist, same ammo, with scope, 5-600 yd MOA is possible under the right conditions, and even under less than desirable conditions, you can still get 1.5 MOA, assuming you do your part, too.
For more power at those long ranges, look into 6.5 Grendel, .260 Remington,
.308, even the .300 Whisper. Again, assuming you do your part, sighting, breathing, trigger control, you should be pretty close, even with, and sometimes beat bolt action accuracy. If I need to reach out and farther and touch something...that's what the .338 Lapua is for