I own three Finn M39s. One VKT and two Sakos. I have only shot the VKT, but have shot it extensively. I used it last month to take second in my first ever VMBAR match (Vintage Military Bolt Action Rifle). My VKT is every bit as accurate as any Winchester, Remingon, Ruger rifle that I own. I am very much against modifying these old war horses but, I bought a scope mount from Darryl on Milsurpshooters.net that replaces the rear sight on the M39 in order to mount a scope scope; this also ensures that the rifle can be restored to as-issue condition with no holes drilled or stocks butchered. I was impressed with the VKT's accuracy and figured it was worth $30 (the cost of the scope mount as I remember) to see just what it could do. I own a number of military bolt actions and am limited in my accuracy testing due to eye sight (and skill). I added a Leupold scout scope and tested it at 100 yards. My first three shots after getting it on paper measured less than 1/2 inch. This was using S&B factory ammo. Like many of these older military rifles, my VKT is sensitive to heat. Once I fire about five rounds the POI starts to climb, opening up groups. Once I saw what the rifle could do, I removed the scope. These are definitely the cream of the milsurp rifle crop.
One of my Sakos is in really nice condition. The stock only has one ding in it on the handguard. The other day I completely disassembled it, cleaned all the old dirt and cosmoline off of it and put three coats of Linseed oil on the very dry stock. It is really a beauty. I guess I will see how it shoots at some point but my VKT shoots so well, I never really got around to trying the others.