EB / Tasco / Nikko 10x42 was the scope to use years back, available for around £150 secondhand - but to be honest I know plenty of shooters who use whatever they personally like and obtain brilliant scores (my mate uses a standard duplex reticle 10x Tasco and usually clears up at the local FT shoot, competing against lads using March/S&B/Sightron etc).
Pick one you like, get to know the aimpoints but most of all practise your range finding would be my advice.
Put on heading 270, assume attack formation