Nikon 8405 User Guide - Page 11

The Nikon BDC reticle has been designed to offer "generic" hold-off points that will accommodate most centerfire cartridges and bullet weights. There is only one way to determine how the accuracy circles work with your rifle and load - that is by actual shooting. The Nikon BDC will offer hold-off aiming points for two hundred, three hundred, four hundred and five hundred yards. For maximum confidence we suggest shooting your rifle at these distances. Generally speaking the reticle is designed to offer hold off points in one hundred yards increments from 100-500 yards using standard centerfire calibers with approximate muzzle velocities around 2,800 FPS(feet per second). When sighted in at 200 yards using magnum centerfire cartridges such as those with muzzle velocities of 3,000 FPS or greater the reticle can provide accurate hold of points for 300, 400, 500 and 600 yards. See the illustration below.