Double grouping as you have pictured, first action screw torque, then look at bedding the rifle,https://www.ballisticstudies.com/shop/Video+Learning/Tikka+rifle+bedding+stock+and+action+preparation.+Part+4+of+Tikka+rifle+accuracy+series.html, ensure the scope is mounted ,oil free, and torqued to specs. Change scopes to verify that it is or is not the scope.
The double group can be tracked down to looseness somewhere in the system, be it action screws, bedding, scope mounts, and /or internals of the scope.
I have many Tikka's and they all have been bedded Foster style.
