Best twist rate for a bolt action Grendel

[FW Conch]

I finished a Savage build in October, and I went with an 8 twist. Haven't been able to shoot it a lot, but my best load to this point is 120grn Nos BT over 8208XBR. My best 5 shot group so far is .640" off the hood of my truck. I hope to shoot the heaviest bullets that will group well, which means the longest bullets, so it is at least 8 twist for me.

Good Luck ... Please let us know what you go with :-))