The Sako 85 I have, has had 5 different scopes on it and 14 hunting seasons and lots of trips to the range a cartridge has yet failed to eject.
The scopes were 3.5x10 Leupold, 2.5x10 Vortex, 6x42 Leupold, 6x SWFA, and Vortex 1x6, if there was to any problem it would be with the SWFA as the windage turret is big.
I had not noticed anywhere marks on the under side of the scope.
What I did notice is that if you gently pull the bolt back the case most likely fall back into the open action.
But , if you cycle the action like you mean it , then as good as any other bolt action I've used.