I would start over.
Remove scope, rings and bases.
Remove barreled action.
Re-install everything making sure barrel is floating, recoil lug correctly positioned, screws not too tight and not contacting action.
Same with base and rings. What scope? If scope is questionable, mount it on a .22 and sight in then bump it and shoot again. make sure not an issue in scope. If scope good, re-install and shoot.
If still no better than 1.5 moa, check crown for burr.
After that, send back to Bergara.