Just be aware of some facts, in SSp's you are looking at 30 year old plus rifles, some a lot older.

They are now considered classics, and parts may be needed, not always easy, and best with specialists to work on them. To continue the cons, they are not so ergonomic as newer 10 mt match rifles, balance, set up, adjustability, trigger quality, and effort and ease of use, modern ones are easier to use. And, they are old rifles and may have been through the hands of amateur repairers/restorers and may have been bodged. And, lets be honest, technology in 10 mt match rifles has moved on a lot in the last 40 years!

The pro's, they are classics, so unless in poor condition or been bodged they will not likely go down much in value, and may likely go up, and they can be very satisfying to use. and great fun. In good condition they will be as accurate as modern ones, and lets be honest, in most cases are a thing of beauty!

So the first question is, do you wish to take up club level 10 mt match target shooting? Or do you wish to shoot a classic SSP because of what it is, and enjoy it for what it is accepting its limitations?

If its the first, but you don't have a big budget, forget the SSP and look for a more modern PCP, Walther LG300, FWB P70 or 700, for not a lot more than you will pay for a good, nice condition SSP.
My advice for any one starting 10 mt, is first join a club, use club rifles, develop, understand where you wish to go, is it just have fun regardless, or to develop to a certain standard?
Then if you wish to shoot to a standard, when you buy your own kit buy the newest and best you can afford!

Now if its the second, just accept its 30 + years old, shoot to the best of your ability, have fun and enjoy it as the classic it is! Just like driving a classic car, OK they are awful compared to a modern one , but boy are they fun!

Am I biased to modern? Sort of, but I do still have my first match air rifle, a Walther LGV Spezial Junior, but my wife used it to win her first national championship (was NARPA then!), she went on to shoot GB team, and internationally, she still has her Original 75 Special that she won her first International medal with, and also her later Walther LGR pre production prototype, but she finished her air rifle shooting career a couple of years ago with a state of the art Walther LG400 Special, and at a retirement demo shoot she used all her rifles from her history from the first through to the last, ask her which one is her favourite? its the LG400!

Whatever ever you get, have Fun.

Have Fun
Robin