I have not done any major testing, I have just adjusted the hopup and aiming before the game.
I shot after something like 35x35cm signs at 45m and 75m, they are on our shooting range. 45m hit almost constantly and 75m I think hit the 3 out of about 10 but all shots were very close, had it been a person I might have hit with them all, there was a little wind so a little hard to do a proper test.
During games I felt it shot just as well as my VSR 10 which is fully modified and and I have played with it as a sniper for 10 years. But it's just a feeling, I think it worked as exactly as you would expect at long distances, I at least got a lot of kills at long distances. .