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- DictionarySmall-bore/ˈsmôl ˌbôr/
adjective
- 1. denoting a firearm with a narrow bore, in international and Olympic shooting generally .22 inch caliber.
adjective
Shooting sports fired with small-bore calibers, usually .22 LR caliber
Small-bore refers to calibers with a diameter of .32 inches or smaller. It may also refer to small-bore rifle competition. The medium-bore refers to calibers with a diameter between .33 inches up to .39 inches and large-bore refers to calibers with a diameter of .40 inches or larger. Miniature bore refers historically to calibers of .22 inches or smaller. Wikipedia