10 ring: The centre ring of the target for pistol, rifle or running-target events, worth 10 points; also known as a "bull" or "bullseye".

   Bore: The interior diameter of a gun barrel.

   Broken target: A shotgun target that falls apart before being fired upon.

   Bull: The centre circle of the target for pistol, rifle or running-target events, worth 10 points; also known as a "bullseye" or "10 ring".

   Bullseye: The centre circle of the target for pistol, rifle or running-target events, worth 10 points; also known as a "bull" or "10 ring".

   Calibre: The unit of measure for the bore of a rifle or pistol.

   Call for the target: To call out a command when ready for the shotgun target to be released.

   Crossfire: To call out a command when ready for the shotgun target to be released.

   Double trap: A trapshooting event where two targets are released simultaneously at different heights and angles and the shooter must fire a shot at each target.

   Firing line: The line where shooting competitors position themselves to shoot their targets.

   Gauge: A unit of measure for the bore of a shotgun.

   High house: The trap house from where targets are thrown from a point higher than the low house in skeet events.

   Hit: A shotgun target that has been struck and broken by the shooter.

   Irregular target: A shotgun target that travels off course.

   Lost: The description for a shotgun target that has not been hit.

   Low house: The trap house from where targets are thrown from a point lower than the high house in skeet events.

   Malfunction: The failure of a gun or ammunition to work properly.

   No bird: An illegal shotgun target, usually because it is broken when it emerges, is not propelled or is released before the shooters call.

   Offhand: The standard shooting position for pistol.

   Primer: The explosive which ignites the gunpowder, in turn propelling the projectile or shot.

   Regular target: An unbroken shotgun target.

   Rimfire: Relating to a cartridge where the explosive that ignites the powder is contained in the rim of the case.

   Running target: A target moved across a track to simulate a moving animal or other target.

   Shooting station: The marked area where shooters must stand when firing.

   Shoot-off: A form of tie-breaker in a shooting competition.

   Sighter: A practice shot fired at the beginning of a match to check sight adjustments. Sighters are not counted toward the final score.

   Skeet: A form of clay-target shooting where targets are thrown from two traps about 40 metres apart and the shooter moves in an arc to different stations, firing from various angles.

   String: A series of shots, normally five or ten.

   Target: A board marked with concentric circles which shooters aim to hit.

   Three-position rifle: A shooting competition where shooters fire rifles from the prone, standing and kneeling positions.

   Trapshooting: The sport of shooting at clay targets thrown into the air by a trap.

   Trigger pull weight: The minimum pressure that must be exerted on the trigger before a firearm will fire.

Credit: IOC

For further info., please visit http://www.olympic.org/uk/sports/programme/disciplines_uk.asp?DiscCode=SH.