sub-caliber round

Sub-caliber ammunition is firearm ammunition in which the diameter of the projectile is smaller than the bore of the gun barrel from which it is fired. Sub-caliber ammunition has several capabilities that full-caliber ammunition does not. For example, it can achieve a higher muzzle velocity than a full-caliber projectile from the same propellant charge, while costing less because of the smaller amount of material used.

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Wikidata
artillery shot, 

artillery shot, harmonica gun, weapon type, 

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Frameless

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