There is just one Olympic running target event. Athletes stand and shoot .177 caliber air rifles with telescopic sights (not exceeding four-power) at paper targets moving across a track 10 meters away. The target has two bullseyes spaced roughly six inches apart; an aiming dot placed between them aids the shooter in tracking. The 10-ring on each bullseye is five millimeters wide, about the size of a pencil eraser.

Only men fire this event at world cups and the Olympics. Competition is open to men and women at U.S., continental, and world championships.

Running deer and running game target, 100- and 50-meter versions of this sport, were part of the Olympics at different times between 1900-88. Today's 10-meter event replaced running game target on the Olympic program in 1992.

The Guns: Shooters fire .177 caliber rifles that use air or gas to propel lead pellets downrange. This is the only shooting event in which competitors are permitted to use telescopic sights-4x magnification or less. World-class running target rifles (e.g. FWB 601, Anschutz 2002, Steyr) typically retail for $1500-$2000.

Course of Fire: The match consists of 60 shots divided into 30 slow runs and 30 fast runs. In slow run, athletes have five seconds to track, aim, and fire at the moving target. In fast run, the target is exposed for 2.5 seconds. Shooters start with their rifles at hip level and can only mount their guns once the target is exposed.

Perfect Match Score: 600 is perfect, 575 is world-class.

Finals: The top six competitors advance to a 10-shot fast-run final. Finals are scored in tenths of a point and added to match scores to determine winners. A perfect final score is 109.0.

Perfect Aggregate Score: 709.0 points.

Last U.S. Olympic Medal: The U.S. has not won a medal in the 10-meter event. John Boles won the gold in running deers shooting at the 1924 Games in Paris.