How good is the wasr10

[Atrain1]

I have a centry Arms wasr10 with all tapco furniture, and an ar15 style muzzle break. I have been trying to sight it in with a red dot scope out at the grass lands. It dug a nice trench (kind of cool to see it was like 30 feet long) so I know it groups well, just wanted to know how good they are and what is the best way to sight it in. Thanks Atrain1