For what you are trying to figure out,a three shot group does not tell you anything.
You might try a series of cold barrel 1 shot groups..as in ones shot at each of 5 bulls.Repeat maybe 4 times,or 20 shots.
And you might want to try 5 or 7 or 10 rd groups.You may see a flier,or you may just see a big group.
You might start with checking all your scope screws ,then doing a re-torque job on your guard screws.The front,recoil lug guard screw is the one that is the "master"Tighten in stages,front screw snug,tang screw snug,front screw 20 in lbs or so,tang next,up to the 60 in pounds or whatever is recommended.
You can try removing the bbl'd action,coating it with something like shoe polish,sight black,candle soot,prussian blue,etc and re-assembling it to see pressure points.
You can try shimming with business card under the flat surfaces of the receiver,that will lift the bbl up from the channel a bit.
You can try a forend shim at the front of the forend.
I suggest you figure out what is causing the problem before you try a solution.