- 01: Introduction
- 02: History
- 03: Propellants, Firearms, and Ammunition Development
- 04: Modern Firearms Manufacture
- 05: Small Arms Ammunition
- 06: Evidence Handling Procedures
- 07: Equipment and Instrumentation
- 08: Examination of Firearms
- 09: Cartridge and Shotshell Examination
- 10: Characterization and Evaluation of Fired Projectiles
- 11: Bullet Comparison and Identification
- 12: Gunshot Residue and Distance Determination
- 13: Toolmark Identification
- 14: Communicating Results
- Resources
Cannelures
Home > Characterization and Evaluation of Fired Projectiles > Physical Features > Base Construction > Cannelures
Type
As previously mentioned, there are two types of circumferential grooves:
- Knurled
- Smooth
)
Knurled grooves)
Smooth grooveCannelures may or may not serve a functional purpose on a given bullet. They are very useful in determining the manufacturer and, in some cases, the stock number of bullets that are used only for specific purposes.
Number
It is useful to document the number of cannelures found on each type of bullet; this further limits the number of candidates when searching for similar examples in reference resources (primarily in a laboratory Standard Ammunition File [SAF]).
Location
Cannelure distance
The location of each cannelure in terms of its height above the base of a bullet is another physical feature or set of physical features used as an additional filter to limit the field in searching reference files.
