calibre

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calibre

The diameter of a tube or cylinder.
Forensics
The diameter of a bullet measured in hundredths of an inch—in the US and in English-speaking countries.
Common bullet calibres  .22, .25, .30, .32, .38, and .45; in metric countries, calibres are measured in millimetres—e.g., .38 calibre corresponds to 9 mm
References in periodicals archive ?
This was not the case when the company first introduced airburst munitions onto the CV-90 back in 2004, he said, when it was "mostly (used against) soft targets." The usefulness of airburst munitions was very calibre driven, Mr.
Calibre size is of course a crucial factor when it comes to lethality.
The 30mm is without question the most popular calibre in the West, Mr.
McFarland pointed to a number of areas of potential development in the large calibre domain in the coming years.