Welcome. I think your on the right path with 168gr bullets on a 330 yard range.
Finding the right ammo is the tough part. 1/2 to 3/4 moa is likely as good as it gets. With 3/4 a good average. That is what we get from 165gr SP @2650 FPS factory hunting ammo.
The FGMM 168gr didn't do any better often more like 1" to 1 1/4".
Good luck!
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