Have had this on a rifle and it was the rail and bases at fault.
Even though the screw were tight and torqued the EGW rail was loose (but not obviously) even though the screw were cinched up. In a rifle of that power it may be a bit undetectable until the shock of the shot is released. Was doing my head in too... swapped optics checked ringa all good. the only way I worked it out was I gave it a forceful shake (out of sheer frustration) and I felt something move...
I then tracked it down to a slight gap between the screw/bolt head and the countersunk hole is sat in. In the end we re-threaded the receiver holes to I think new M7 bolts and sweet as!!
hoping this is as easy for you... Ah yeah and was Tikka 7mm rem mag that then we got to sub .5 moa.
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