An example of one, FWIW.

An Aero 22" 6.5 CM upper (Brownells) SS BA 5R barrel.
3-15 Steiner glass, handload with 140 ELD-M averaged 3/4 MOA or under at 100 (3 shot groups- load development).
Had no problem maintaining MOA at 600 yds/6", or better for 5 shots.

I was fortunate that the load used in a couple bolt guns shot 'good enough" in the AR.