Saw this old thread and thought I would add my $0.25.
Had the opportunity to shoot an apparent fake Finn Mosin sniper that was actually a very good shooter. This particular example was not an interordnance wonder, but something else again.
It appeared to be a legit. 91/30 capture dated 1939 with SA markings and a war time Finn stock, it clearly could not be an original PU, because they were not made in 1939, but it had a correct Russian PU scope, and a correct scope mount. I liked it too because of the significance of the year 1939 with the Soviet aggression toward Finland, and Finland's heroic stand.
As for how it shot, side by side with a legit. Russian Mosin 91/30 PU, the Finn capture did slightly better, but not by a wide margin, grouping around 1-inch at 100 meters using 7N1 ammo. The trigger was not very good, and that rifle really looked like it had been in a war, but that thing did shoot!
The bent bolt appeared to be the fake type, more of a chromed look to it than the authentic. Parts were all non-matching, but that is typical of a Finn rework.