Short action Sakos have lower ejection angle than larger actions. There's usually a question of if they'll eject into the scope so a rail on M size or larger would almost certainly be a no-go.
Is that experience with a rail or just speculation?
The only ejection problems I've ever heard of were with 85's in long actions. I've not heard of any 75 ejection problems regardless of action size.They moved the extractor position on the 85's bolt.
That's experience with ejecting into actual scopes. If Near says M actions don't have clearance issues with a rail I don't believe it. I've owned around 10 Sako 85s most of which are M size. Many will hit bottom of a scope tube if mounted with low rings. Topic has been well discussed here and can be confirmed by Eurooptic or any other retailer of Sakos. A rail sits way lower than a scope tube so I just don't believe it would clear.
First thing I do with any new Sako is mount a lapping bar and see if empties will hit it. I then take a piece of paper and hold it over the ejection port while ejecting empties lowering it more each time til it hits. I'm very sure I've never tested a 75 or 85 that would clear a rail.
75 and 85 extractors both sit at 10:00. Lower portion of 85 bolt face is removed to allow a form of CRF. I've had 75s eject into bottom of scopes too although not as common.