Would think that after 50 or so years Sako might have ironed out any problems with their dovetail system. If a fella can't manage to tighten up a couple screws on a Sako mount, I wouldn't expect that having 4 screws would be any better. They are tapered and they have a limiting pin to resist any movement. I think any problems would come from using Sako mounts made by other companies - they often are less well made and don't have the limiter pin.
As for the A7 - haven't had the pleasure, but it's built off a modified Sako 75 with the 5shot/1inch guarantee...seems like a winner to me.
