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- Dictionarysmall-bore
adjective
- 1. denoting a firearm with a narrow bore, in international and Olympic shooting generally .22 inch calibre (5.6 millimetre bore).
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adjective
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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