The most common Air gun calibers are:
- .177" (4.5 mm) - the most common caliber, also used in ISSF shooting events at the Olympic Games, it has the flattest trajectory of all the calibers for a given energy level, making accuracy simpler.
- .20" (5.0 mm) - found in some European air guns and those manufactured by US air gun manufacturer, Sheridan. This is generally considered to be a 'compromise calibre', having a flatter trajectory similar to the .177 but more energy retention. .20" pellets tend to be of a similar weight to .22" pellets, but with an elongated profile, resulting in a higher Ballistic Coefficient (BC) than either .177" or .22" pellets.
- .22" (5.5 mm & 5.6 mm) - the most common caliber for hunting small game, as it delivers large amounts of energy on impact (more so than the smaller calibers).
- .25" (6.35 mm) - the largest commonly available caliber. This caliber is renowned for its impact, having the most energy retention of all calibers. However, it does have a highly parabolic trajectory at low energy levels and is thus more suited for higher powered rifles.
Custom air gun manufacturers regularly produce air rifles in common muzzle loading rifle calibers too, such as .45" (11.25 mm), .50" (12.5 mm), .58" (14.5 mm) and larger.
refer:wikipedia.org
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