I'd *definitely* be looking to buy good second hand glass in the 3-12 magnification range, with a 50mm bell size.
That will cover all your bases very nicely, from woodland to open fields. But nor would it be over the top at either mag end, or unbalance the rifle by being too big.
Personally, I'd be holding out for a 3-12×50 Schmidt + Bender with A7 reticle in good condition, which you might pick up for around £500 or a little more. But this Swarovski would do just as nicely (I've zero connection with the seller):
Swarovski 3- 12 x 50 PVi-2 scope Made in Austria I would call this scope the stepping stone between the Habicht series and the Z6 series, it is of high quality and has very nice glass and build quality. 30mm tube. Illumination fully functional. Reticle 4-i (image in the lower comments)...
www.thestalkingdirectory.co.uk