Well with a Tikka and Optilocks it is not a problem with the mounting system it is the best factory setup there is, if the scope is ok is mostly likely shooter error
or the bedding has gone off, I would shoot a 5 shot group at 200 metres off sandbags; bipods are not the best to shoot off a solid bench they bounce, the torque
from the rifling can throw the shot in the direction of the twist.
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