Wot he said, start with the simple things and tick them off one by one.
Have the shop recheck all the screw tensions. The scope mount and ring screws should imo be blue loktited to prevent vibrating loose.
Shoot With and without supressor three rounds each should do. Shoot off sandbags and have a consistent cheek weld and hold. Shoot slow and deliberately so the barrel doesnt heat up excessively. Record where each shot falls. The groups will be in different places but thats to be expected as the supressors weight changes the barrels harmonic.
If the second shot is some distance from the first but the third is back close to the first bedding is the problem.
Have someone else shoot the rifle if it shoots fine, you need to be serviced not the gun
Try a different weight bullet.
Looking at a change of optics should only be considered as a last resort.
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