rules (as well as to limit damage to the targets), Field Target in the Netherlands is shot with rifles with a maximum muzzle energy of 16.3 Joule (12 ft-lbs). New Zealand In New Zealand there is no legal maximum power limit for ordinary air gun use, however a Firearm Licence is now required to possess any precharged air rifle The general guideline is that the power of an Air Rifle used in a Field Target match must not damage the targets. All Field Target competition is "open class", and competitors participate in their own official "International" class, as do spring/piston air rifle competitors. Maximum/minimum distances are 10 m to 50 m. Membership of NZAFTA; the RGB to WFTF, consists of eight member clubs Nationally. Poland In Poland the energy limit for air guns is 17 joules (air guns above this limit must be registered and may be used only on shooting ranges). Therefore, the PFTA (Polish Field Target Association) has adopted the British limit of 16.3 joules (12 ft⋅lbf) for competitions. Spain In Spain the maximum rifle power is the legal limit of 24.2 joules. This power allows the use of .22 caliber without problems. The range of the targets must be between 9 meters and 50 meters. "Kentucky windage" and scope adjustment are used. Sweden The energy limit for a license fre air gun in Sweden is 10 joules, hence there are three classes. National (10J), International (16.3J) and full power (45J, formerly unlimited but has been limited due to damages on the targets), the two later classes required a firearms licence. United States In the United States, the American Airgun Field Target Association (AAFTA) rules set a maximum rifle power of 20 ft·lbf (27 J) primarily to limit damage to targets — there are no laws limiting airgun power in the United States. Individual competition rules may impose limits on power and/or other criteria at the discretion of the local match director. The increased velocity of the pellets from these higher power rifles primarily reduces the effects of distance (pellet drop) and windage (time of flight determines wind effects) but the game is, otherwise, quite similar to that of Britain and other countries. In the US, kill zone diameters vary from a minimum of 0.375 inches (9.525 mm), to a typical kill zone diameter at distance of 1-1/2 inches (3.81 cm). Occasionally, kill zones to the maximum allowed