Finally got my hands on a Steyr zephyr 22. Came with a pecar 2 3/4 x64 Scope and mounts, could do with some TLC. Stripped the rifle down and a good going over and clean. Re assembled and quick sight in over a garden chair at 25 m. Couple of batches wouldn't feed but the RWS and CCI quiet look promising.
Serial number puts it around 1955-56 # 6XX
heres some pics

sub sonics and groups win and highland wouldn't feed 25m 5 shots

10 shots cci