It would be nice if everyone share there best setting or a base setting that work. It doesn’t matter which caliber. I have my impact for a week and just starting to tinker. It’s not easy. My best setting shooting hole in hole ad 45 yards is : barrel .22 , length 600mm, valve stop is max open (4 line visible), reg 92 a 93 bar, hammer spring gap 22,0mm and power wheel max, JSB 18,13 gr, 858 fps.