cannelure


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cannelure

[′kan·əl·u̇r]
(ordnance)
A groove in a bullet which contains a lubricant, or into which the cartridge is crimped.
A groove in a cartridge case providing a purchase for the extractor.
A ringlike groove for locking the jacket of an armor-piercing bullet to the core.
A ringlike groove in the rotating band of a gun projectile to lessen the resistance offered to the gun rifling and to prevent fringing grooves.
References in periodicals archive ?
40 S&W bullets need no such cannelure or crimping groove.
was given an order for 200,000 rounds for their shorter cartridge, with an added case cannelure and a knurled cannelure on the bullet.
it has a positive stop for control of cannelure depth, yet can also be operated by "feel" with good results.
Burst barrels were apparently caused when the lower portion of the bullet's brittle steel jacket separated behind the crimping cannelure while the projectile was moving across the unsupported 4mm section of chamber and remained in the barrel.
Furthermore, these projectiles must travel varying distances before they break apart at the cannelure.
Switching to Speer 300-grain "Plinkers," proved a better bet as they can be crimped into the top of the cannelure.
West German military bullets in this caliber, as well as Swedish, feature steel jackets which break apart at the cannelure upon penetration in living tissue with far greater tissue-disruption capability than 5.
30-30 cases with a 170-grain Speer roundnose seated to the cannelure, and they came out exactly the same to 1/10th of a grain
The bullet in each caliber has a tapered jacket profile with a cannelure to lock the jacket to the bullet's core.
308 Marlin Express SST, but with a tougher jacket and a different ogive and cannelure position for the Savage round.
The cannelure is a locking tool that keeps the bullet located right where it belongs.
Sometimes in the M1 it seems as if a crimp in a Hornady bullet's cannelure helps with the errant first shot problem.