The main features of the Sweet 22? are their ability to compensate for bullet trajectory by specific grain weight. The elevation drum will compensate for .22cal grain weights of 36, 38, and 40.The Windage and Elevation turrets have zero reset with Allen screw. Each model in the Sweet 22? series have an adjustable side parallax setting of 7.5 to infinity (With the exception of the model S22-618x40SP which is 10 to infinity).