BSA Optics Sweet 17 Riflescopes is calibrated to adjust for elliptic bullet drop at any distance between 100 and 300 yds. It features a zoom ring that has an inner drum with markings, and a fixed inner ring with a window cutout. This scope is waterproof, fogproof and shockproof. The BSA Sweet .17 SP rifle scope is specifically designed for the .17 HMR. This series features side parallax adjustment from 10 yd to infinity, fully multicoated lenses, 3 inches sunshade and fast focus. The Sweet 17 SP features an elevation turret ballistically calibrated for a 17 and 20 grain cartridges. Features: Fully multi-coated lens 10 yd infinity parallax setting Side parallax adjustment 1 year warranty