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Adjective: .22 caliber
Usage: US (=.22 calibre)
  1. Of or relating to the bore of a gun (or its ammunition) that measures twenty-two hundredths of an inch in diameter
    "a .22 caliber pistol"
    - .22-caliber, .22 calibre [Brit, Cdn], .22-calibre

See also: caliber [US]