What ammo did you try? Maybe your gun doesn’t like a certain ammo batch or ammo configuration.
Have you tried Hornady bonded 308?
Even my good old Model 70 can shoot sub 2 MOA with run of the mill Power-shok if I let the barrel cools, and I count flyers and I don’t shoot from lead sleds, very non-nerdy prone in my back field. And I had a Savage 110 ba variant that could do the same with non-match stuff at close distance (100 yard). Ammo batches do matter I found, however hand loads always more consistent.