ok, generally what people want with an airgun is quiet .. for likely less money one could get a target rifle with threaded muzzle, a silencer stamp and moderator, and set up a quiet powder burner for way less money than a high end airgun and youd likely get better accuracy and power, but you need subsonic ammo to keep it quiet .. that means pretty much sub 1100fps with around 900 having the most stable characteristics in flight .. you adjust that with your pellet weight and the gun needs the capability to push the pellet weight