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
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 in the rotating band of a gun projectile to lessen the resistance offered to the gun rifling
Ringlike groove cut into the outside surface of a water-cooled machinegun barrel into which packing is placed to prevent the escape of water from the breech end of the water jacket; cannelure cut