A bullet with a flat, circular head the same diameter all the way along its length. Especially used in target shooting as they punch a neat round hole the same diameter as the bullet and thus make scoring easier.
A wadcutter is a bullet specially designed for shooting paper targets, usually at close range and with significantly subsonic velocities under 800 ft/s (244 m/s) such as are found in handgun and airgun competitions. A wadcutter has a flat or nearly flat front, which acts to cut a very clean hole through the target, making it easier to score and ideally reducing errors in scoring to the favor of the shooter. Since the flat nosed bullet is not well suited for feeding out of a firearm's magazine, wadcutters are normally used in revolvers or specially designed semi-automatic pistols.