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#21 Axe

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Posted 11 December 2007 - 02:32 PM

T
Tanning
The art or process of making leather from rawhides.

Target
The object, usually made of thin card, at which shooting is directed and which enables scoring of the results.

Telescopic Sight
A sight built into a telescope and designed such that the reticule and the target are in focus at the same time. For target shooting purposes the sight must have parallax correction to be of any use.

Throat
The unrifled part of the bore immediately in front of the chamber.

Throat erosion
The erosion of the throat area caused by the hot gasses of the propellant burning away the metal and limiting the barrel's useful life. This is mainly a problem of high pressure rifle cartridges.

Torque reaction
The tendency for the gun when fired to twist in the opposite direction to the rifling. This can be a real problem for pistols when shot single handed, less so for rifles.

Trajectory
See bullet path.

Trap
1. Mechanical device to capture legal pest and predatory species.
2. A device which throws clay pigeons

Trigger
The device normally operated by the shooter's index finger that initiates the firing of a gun.

Trigger Shoe
A device which fits over the standard trigger so as to offer a wider surface to the trigger finger and thus give the impression of reducing its apapparent weight.

Trigger stop
A device to limit the over-travel of a trigger when pulled: see over-travel above.

Trigger Weight
The weight that a trigger must support to comply with competition rules e.g. for air pistol it is 500 grams, for air rifle there is no lower limit as long as the gun is safe to use, or, the weight used to check a competitor's trigger before passing the gun as complying with the rules for shooting.

Turning Targets
A device, usually electrically operated (but may be pneumatic) that twists a target through 90o very rapidly so as to present the target to the shooter. Used in timed fire events and controlled by an electronic timer.

Twist
The turn of the rifling. For example a barrel with a 12 inch twist means that for every 12 inches of movement down the barrel towards the muzzle, the projectile makes one complete turn (revolution).

Two stage trigger
A type of trigger which has (normally) about half the trigger weight to fire the gun taken up by a relatively long rearward movement and the remainder by a crisp sudden let off. This is a device to enable easier shooting, by giving the shooter some idea as to how much weight has been taken up before the shot is fired.

#22 Axe

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Posted 11 December 2007 - 02:33 PM

U

No entries for U.

#23 Axe

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Posted 11 December 2007 - 02:33 PM

V

Velocity
The speed of a projectile after it has left the barrel normally measured in Feet Per Second.

#24 Axe

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Posted 11 December 2007 - 02:33 PM

W

Wad
A disk, or series of disks of soft material used to seal the projectile and powder into the cartridge and or, gun.

Wadcutter
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.

Wheel Lock
An early type of muzzle loader lock system which came before the flintlock. A spring driven wheel was released by the trigger. This spinning wheel struck a shower of sparks off a lump of pyrite which led to ignition of the priming charge and hence the main charge. Wheel Lock guns were expensive to make and relatively difficult to keep in good working order; as a consequence many were converted to Flintlock operation.

Wildcat
A cartridge designed and made by a handloader by altering an existing cartridge case and usually displaying enhanced velocity over the original donor cartridge.

Windage
The lateral sight adjustment so as to move the point of impact sideways on the target, this is usually, but not always done by the rear sight.

Wind-doping
The ability to read the changing wind conditions at long range outdoors, so as to be able to compensate for them on a shot-by-shot basis.

Wiping-out
A somewhat vague term, used to indicate the removal of oil from a muzzle loading gun before attempting to load it for the first time at a shoot and also the quick clean and squirt of oil down the barrel at the end of a shoot before packing up to leave the range.

#25 Axe

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Posted 11 December 2007 - 02:33 PM

X

X-Ring
The name given to a smaller inner ring enclosed within the 10 ring and used as a tie-breaker. Normally the X-Ring does not have a numerical value: see also 'Inner 10' above.

#26 Axe

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Posted 11 December 2007 - 02:33 PM

Y

Yaw
The motion of a bullet in flight spinning erratically around its own axis, this is mostly due to air pressure on the nose of the rotating projectile.

#27 Axe

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Posted 11 December 2007 - 02:33 PM

Z

Zero
The sight settings in windage (lateral) and elevation (vertical) where the point of aim and the point of impact coincide. It can be set to any range desired.

Zoom
A term used to describe variable magnification optical devices. In the case of telescopic sights a magnification of about 4x is the maximum for shooting from the unsupported standing position, 10x for prone shooting and anything up to 30x and above, for bench-rest shooting.




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