My first suspicion is the scope mounting. There are a lot of ways that can go haywire. You might want to make sure you have done all the following:
Check to see that the front screw on your base is not bottoming out against the barrel. Don't laugh. It happens, and is hard to find.
Do not attempt to mount the bases, rings, etc. without a torque screwdriver.
Use blue Loctite to secure the base mounting screws. If you do not, and torque them to spec, they will often work loose. You will lose accuracy before you can detect movement.
Insure that the rings are properly aligned. A short piece of 1" dowel works for this.
I'm not familiar with your particular rings, but if they are aluminum, the cross screws can easily be over tightened. The bond between the head of the cross screw and the ring will "pull through" and be below flush. This can easily be cured by gently knocking the screw back out, adding JB Weld to the head, and using the opposing nut to pull it flush. That's about what the manufacturers do in the first place.
Make sure the rifle is level, and the scope is level. Then add the top ring and gently tighten. Check eye distance, and when you are satisfied that the scope is properly positioned, secure the screws with blue Loctite and torque them to spec.
If you do all that, and it still shoots poorly, the next step is to use a known good scope. If it shoots poorly after that, then it's the rifle or ammo and not the optics.
Next thing to do is check the front and rear action screws to make sure they are torqued to spec, and you might secure them with blue Loctite. Beyond that, its things like barrel rubs.
And, as mentioned, shoot off a good rest and rest the forestock, not the barrel on the rest.
Good luck. Let us know how things work out.