Check that suppressor is screwed on tightly. If it isn't tight, the inconsistent vibration will play havoc with accuracy.
Remove bolt and check that everything lines up from the chamber end. I had a 303 with a suppressor that belled and became misaligned with the bore, throwing groups of about 20cm. Next thing that happened was the reticle became dislodged, but then I couldn't hit the side of a barn at 20m. But that was a Tasco.
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