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 diameter are theoretically possible, but practically shot groups of are considered highly competitive. Unbatched ammunition, especially if the air gun is not regularly cleaned, is generally thought to be capable of only 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 i.e 570 for the qualification round). The occurrence of high scores in modern times is mainly due to the continuous development of the employed match air rifles from spring-piston type designs into single-stroke pneumatic and then regulated pre-charged pneumatic (PCP) designs. Modern PCP match rifles from the leading manufacturers all feature regulated PCP powerplants to minimize shot-to-shot output pressure variations and hence muzzle velocity inconsistency, mechanical or electronic match triggers offering low shot development time (at low lock times factors like the dwell time of the pellet in the barrel become influential), 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 like the non-magnifying target shooting diopter and globe sighting line 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 sub-10.0 average result can be attributed to the participant and at 2019 top competition level a 10.5 average result can be regarded as excellent. Gallery World Championships, Men World Championships, Men Team World Championships, Women World Championships, Women Team World Championships, Mixed Team World Championships, total medals Current world records Post 1 January 2013 World and Olympic Records Post 1 January 2018 World and Olympic Records References ISSF World Records ISSF Official Statutes Rules and Regulations ISSF shooting events Rifle shooting sports Pneumatic weapons