wadcutter: A special-purpose bullet specially designed for shooting paper targets, usually at close range and at subsonic velocities typically under 800 ft/s (240 m/s). They are often used in handgun and airgun competitions. A wadcutter has a flat or nearly flat front that cuts a very clean hole through the paper target, making it easier to score and ideally reducing errors in scoring the target to the favor of the shooter.
wheellock: an obsolete mechanism for firing a firearm.
windage: The side-to-side adjustment of a sight, used to change the horizontal component of the aiming point.