1837 W. J. Neale xxxviii. 222 The lieutenant..gave them to understand that it was merely one of the small calibre guns, to point out that the hour had commenced, and that the red flag was hoisted.
1896 31 Oct. 589/1 If it be suitable, the small-calibre bullet will do much more damage.
1996 17 Oct. i. 1/7 A similar penalty will apply to people who keep the permitted small-calibre handguns outside gun clubs.