Before you start making any drastic changes, get a mate (preferably one that consistently shoots good groups) to shoot the rifle, and also try it without the suppressor.
If that does not make a difference, find someone on here close to you that has a torque screw driver, and check the action screws, bases and ring screws.
Also would not hurt trying different ammo, maybe something lighter or heavier than your current bullet. Sometimes rifles just don't like a particular load.
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