Bullet hole tester

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Shot hole tester according to the regulations of the German Shooting Association for different calibers

A plug gauge is a theory that the shooting sports to the unique location of a bullet hole is used on the disc to be determined.

Bullet hole testers for sporting competitions are manufactured for different calibers and consist of a pin ("spindle") the size of a caliber with a chamfered edge and a narrow "measuring ring" or "collar", which has a fixed size and is usually larger than the caliber of the firearm used is. For example, caliber .22 lfB , a spindle has a diameter of 5 mm, and the measuring ring has a caliber diameter of exactly 5.6 mm. In contrast, the diameter of the spindle for the 9mm Luger caliber is 9.65 mm and is therefore slightly larger than the bullet diameter , which is also the case with all other calibers. Therefore, a hit with caliber .32 has its edge almost one millimeter outside the ring dividing line, opposite a shot hole with caliber .38 Special , while the two shot holes, measured at the center, would have exactly the same distance from the center of the target .

A short coil spring with a handle, which is often provided with the logo of the sports association, is usually used as a handle.

If the examiner is put in a shot hole, it is immediately and clearly recognizable whether he is touching or covering a ring on the target with his collar (this ring counts) or whether he is not touching or covering it.

Bullet hole detectors can be equipped with a magnifying glass that is attached above the collar.

The examiner for the air pistol , crossbow 10 m / 30 m , and muzzle loader discipline has a special feature: the collar is much wider than the caliber and is used as an outside gauge. It is checked whether the collar on the outside still protrudes beyond the dividing line of the lower rings. This makes it possible to change the location of the shot hole, e.g. B. with the air rifle (the punctiform 10 here has a diameter of 0.5 mm), to be evaluated on the basis of the more easily evaluable dividing line between 7 and 8. The bullet hole tester is supported here, figuratively speaking, on the outer edge.

Bullet hole detectors may only be inserted once, otherwise they will wear out the bullet hole (inaccuracies). The spring is a good indicator for recognizing tampering with the shot hole (widening) or repeated insertion of the tester: In the case of unmanipulated shot holes and those that have not yet been tested, the spring visibly elongates when the tester pulls out. In the case of "worn out" / manipulated holes, it will not do it.

Just as the bullet hole tester may only be inserted once, spindles for detecting double shots may only be inserted once, and only if no bullet hole tester has been inserted and vice versa. Therefore you can either determine the shot value exactly, or whether 2 hits had exactly the same position (hole in hole, or double shot). However, statistically, double shots occur very rarely, since fewer shots are fired at a target in competitions as the level rises, in order to limit the problem of touching holes. In principle, the shot hole tester can only be evaluated on circular holes without touching another hole with the shot hole tester. For elongated holes (which can occur with hinged panes) and the like, there are then transparent foil gauges with line patterns to be placed on the hole.

With the increasing use of electronic targets , the use of the bullet hole tester has faded into the background in recent years (as of 2013). In particular, higher quality competitions are i. d. As a rule, it is generally carried out on appropriately equipped shooting ranges so that there is no longer any manual evaluation of hits on cardboard targets.

Individual evidence

  1. Sports regulations DSB (as of: January 1, 2011): Shot hole tester rule number: 0.11.1.8
  2. Sports regulations DSB (as of January 1, 2011): Evaluation of the shots, rule number: 0.11.1.7
  3. Sports regulations DSB (as of: January 1, 2011): Shot hole tester external gauges, rule number: 0.11.1.8.2 + 0.11.1.8.3
  4. Sports regulations DSB (as of January 1, 2011): Evaluation of rule number: 0.11.1.3