slightly under .25 or a quarter inch. the well-known .22 caliber is 5.56 MM. the memory jog for me is my birth year- l956. The Japanese service rifle of 6.5MM was rated as ( .25 caliber) by Rifleman and other Gun periodicals. nice question.
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.223 Calibre although .223 Will fit on a 5.65 mm, a 5.65 mm Will not fit in a .223 calibre chamber.
6 metres = 6000 mm.
There are: 6*100*10 = 6000 mm
6 m (1000 mm/1 m) = 6000 millimeters -----------------------
There are ten millimeters to a centimeter. 6 cm = 60 mm