Factory sighting is useally dead on.....as evidenced by a staked front sight.
I wouldnt be too concerned about shooting to the left or right until you are sandbagged up and very familiar with the gun and its trigger pull.
Doesnt take much of a flinch @ 1hundy to pull significantly left or right on the paper.
And even then ammo could be the issue....guns like what they like ...despite all things being equal.
(2) k98 byf 43 and (1) box of M75 ammo can/ will = drastically different results.
If you are not going to shoot it a lot I wouldnt worry about accuracy because it can take awhile to find a diet it likes.
Enjoy your new gun...congrats on what sounds like a great find.