Definitions for "Cannelure"
A groove in any cylinder; specif., a groove around the cylinder of an elongated bullet for small arms to contain a lubricant, or around the rotating band of a gun projectile to lessen the resistance offered to the rifling. Also, a groove around the base of a cartridge, where the extractor takes hold.
Circumferential groove(s) around a bullet or cartridge case. Used for identification, to hold lubricant, or to crimp case into.
1. A circumferential groove generally of corrugated appearance cut or impressed into a bullet or cartridge case 2. Sometimes used in reference to an extractor groove.