There are mainly two types of scoring gauges used for paper and cardboard targets, either the "cone shaped" tool or a transparent overlay.
In modern olympic precision shooting competitions there is usually no manual evaluation of scoring hits any more.
[2] Overlay gauges can be used several times without affecting the target, making it possible for several referees to evaluate a scoring in case of doubt.
Electronic targets do not need physical inspection, but rather relies on a programmed gauging of the bullet hole.
Caliber independent gauging is solely used on both paper and electronic targets in olympic precision events.