You should always glue/locktite a rail/mounts on a Tikka of any action especially if you have a decent size scope on it
The heavier or higher the scope the more inertia there is on it
This is a common problem on Stiller actions, even though they have dowels
If you watch slow-mo videos you will see the scope oscillates up & down as well as back & forth
It gets worse if you have a decent muzzle brake as the rifle initially moves back then it goes forward as the brake starts to work & the scope wants to stay where it is
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