Optimal barrel length for 6.5 grendel AR?

[Wolfdog91]

So true thinking my new AR build from 5.56 to 6.5 grendel. Would like to have it about as optimal as possible to get as much accuracy that little cartridge as possible. I know some calibers apparently have optimal barrel lengths for various reasons . My little 10.5 grendel pistol really doesn't seem like it's one of those daels so what is a pretty optimal barrel length ( or ball park figure don't need some golden perfect thing lol) for the grendel?

 

[5spd]

2 I did on ar15 frames, 20 and 22", 1/8" tw, both ran 85g bullets at a little under 3000fps.
The 22" was my favorite though.
Both were great coyote, deer, antelope rigs.