March 9, 2007: The U.S. Air Force has started using a new 20mm round for its aircraft cannon. The PGU-28A/B round has a higher velocity (because of more propellant), and the shell has a more ...
June 19, 2007: The U.S. Air Force is shifting from high-explosive 20mm shells in its F-22, F-16 and F-15 fighters, because of the risk of those shells exploding in the barrel, and the availability of ...
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