Zero - More correctly, "Zero Sight Adjustment." That adjustment of a gun's sights placing a properly aimed shot at the desired point of impact at some range with a given load, in the absence of wind. The basis from which subsequent sight adjustments are made.


Zero Range - The distance at which the bullet path exactly coincides with the line of sight (LOS). Each gun/load combination actually has two zero ranges—one near the muzzle as the bullet rises through the LOS and another at some greater distance where the bullet descends through the LOS. Normally, it is the second zero range that most shooters recognize.