Equipment
For the 10 metre air rifle and air pistol disciplines match diabolo pellets are used. These pellets have wadcutter heads, meaning the front is (nearly) flat, that leave clean round holes in paper targets for easy scoring. Match pellets are offered in tins and more elaborate packagings that avoid deformation and other damage that could impair their uniformity.
Match air rifle shooters are encouraged to perform shooting group tests with their gun clamped in a machine rest to establish which particular match pellet type performs best for their particular air gun. To facilitate maximum performance out of various air guns the leading match pellet manufacturers produce pellets with graduated "head sizes", which means the pellets are offered with front diameters from 4.48 mm (0.176 in) up to 4.52 mm (0.178 in).
However at higher and top competitive levels, even these variations are thought too coarse-grained and match pellets are batch tested; that is, the specific gun is mounted in a machine rest test rig and pellets from a specific production run on a specific machine with the same ingredients fed into the process (a batch) are test-fired through the gun. Many different batches will be tested in this manner, and the pellets which give the smallest consistent group size without fliers (shots which fall outside of the main group) will be selected (small but inconsistent group sizes are not useful to a top competitor); and the shooter will then purchase several tens of thousands of pellets from that batch. Group sizes of 4.5 mm (0.177 in) diameter are theoretically possible, but practically shot groups of 5.0 mm (0.197 in) are considered highly competitive. Unbatched ammunition, especially if the air rifle is not regularly cleaned, is generally thought to be capable of only 8.0 mm (0.315 in) diameter group sizes. Batch testing match pellets for a particular gun is not generally thought to be worthwhile until the shooter reaches a high proficiency level (around the 95% level (570 for men, 380 for women).
The occurrence of full marks scores is mainly due to the continuous development of the employed match air rifles from spring-piston type designs into single-stroke pneumatic and pre-charged pneumatic (PCP) designs. Modern PCP match rifles from the leading manufacturers all feature fast lock times, shoot practically recoilless and vibration free, exhibit minimal movement and balance shifts and can be tailored by an adjustable aluminum stock and other user interfaces and various accessories to the individual shooters personal preferences to promote comfortable and accurate shooting from a standing position. Combined with appropriate match pellets these rifles produce a consistent 10 ring performance, so a non maximal result during the initial phase can be attributed to the participant.
Read more about this topic: 10 Metre Air Rifle
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