They are primarily ex-snipers because of the SVD. US 1903A4's and M1C's are often ex-snipers because of the M-40 and later replacements. Some of any of these are still excellent shooters and some are not. Condition is always a factor.There is a reason they are EX-snipers, their accuracy may have degraded over the years, or as I have heard that they designated many of them to be snipers,and then need more infantry rifles and "ex'ed" them.
Again all things being equal if it starts off more accurate it should end up more accurate. Any wear on a exsniper can be found on a neversniper (I coined that in this post ) if you take a random sampling large enough to satisically make wear the same between the groups I would expect the exsniper group to show better accuracy by a slight margin.Yes, no, well maybe, Hmm Condition is everything!-SDH