A couple of questions....
Hunting sights? Peeps? Full Race target peeps?
With hunting opens, maybe 1.5" at 50yds., hunting peeps definately 1" or better at 50 yds., With NRA targets and Modern target peeps, 1/2" and better are attainable at 50yds. With the target apeature sight at 600 yds. I have shot about a 10" 10 shot string, prone with a sling, no bench rest. Others have done considerably better than this at 600 yds. ( I have scored their targets!
So what are you able to do?