For shooting and usage, all M39's have the same accuracy potential, the variables are bore condition and how well the gun is still bedded today. Sometimes M39 shims can be missing from importers disassembling them to weed out hte antique receivers in the USA, or importers swapping stocks around (some people claim this happened to re-unite rare stocks with appropriate barelled actions stateside), or from wood warping or swelling and affecting the original bedding setup.
These are the same things that affect ANY milsurp rifle, so don't let this sway you overly.