What Does Cannelured Mean?

A cannelure is a groove or channel around ammunition, either bullets or cartridge cases. The cannelure may be pressed into or cast with the bullet or case.

What does the Cannelure do on a bullet?

In cartridges, the cannelure is a band pressed into the case which helps prevents cartridge setback when the case mouth is properly crimped onto the cannelure. Bullet setback of . 1" can increase pressure beyond safe limits and possibly cause a catastrophic failure.

What is meant by Cannelure?

1 : a groove running lengthwise on the surface of a cylinder or column. 2a : a groove around the cylinder of an elongated bullet for small arms to contain a lubricant. b : a groove around a bullet into which the edge of the cartridge case is crimped.