I’d still like to know for sure if tikka actions are threaded metric..some research tells me they’re not:

https://rifleshooter.com/2017/09/building-a-custom-tikka-t3t3x-precision-rifle/

https://forum.snipershide.com/threads/gunsmiths-who-have-worked-on-tikka-t3-actions.185177/

I’m also pretty sure the scope base mounting holes are threaded US (or SAE)