I have 4 Sakos in different chamberings - all with the tapered dovetail - and have used a number of different scope mounts over the years (Optilock ringmounts, Optilock w separate bases + rings, Leupold ringmounts, Leupold QR bases + rings, Original Sako steel ringmounts, Warne ringmounts, Warne QR ringmounts, MAK one-piece mount for Aimpoint Micro and even some crummy Weaver/Picatinny bases in aluminium - and probably some more I can't remember right now).
Apart from the Weaver bases, everything has worked fine for me, though I've heard about mixed experiences from others regarding the Leupold QR bases.
Optilock is probably the best from most perspectives, as the plastic/polymer ring protects the tube from being damaged. And it allows for the scope being mounted with a minimum of tension. The downside is that all the Optilock models are quite high. Even with the lowest possible option (the ringmounts) they can still accomodate a 42mm objective bell with ease, maybe up to 50mm. That is a bit wasteful if you have a DG, or driven hunt, type of scope (e.g. a 30 mm straight tube).
And don't worry about the bases coming loose. Recoil energy will work the opposite way, essentially 'hammering' them even tighter.