Definition of cannelure

Ringlike groove in the jacket of a bullet which provides a means of securely crimping the cartridge case to the bullet; analogous to the crimping groove in artillery ammunition.
Ringlike groove for locking the jacket of an armor piercing bullet to the core.
Ringlike groove in the rotating band of a gun projectile to lessen the resistance offered to the gun rifling.
Groove around the base of a cartridge case where the extractor takes hold.
Ringlike groove cut into the outside surface of a watercooled machinegun barrel into which packing is placed to prevent the escape of water from the breech end of the water jacket; cannelure cut.

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