I live in Turkey and have the Nova Star in .22. Accurate at 50 metres (sub moa), have not stretched it further yet. Mine detuned a little bit to shoot JSB 18.13 @900fps. Full string 250-110 bar 130 shots ES 38fps but 230-120 bar 95 shots ES 24fps. Trigger adjusted now just over 1lb.
Just checked thru my notes as I have chrony'd another 4 sessions all starting at 230 bar and the extreme spread of all shots with 18.13 pellet was 29fps but I did shoot at different times of day so there was temperature variance of 8-10°C.
If you get a Hatsan Have a look at joining Hatsan air guns Facebook page. It is American based but members include boss of Hatsan USA, boss of Hatsan Turkey so can be useful for info.