- 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
FBI GRC File Standards
Home > Characterization and Evaluation of Fired Projectiles > General Riflling Characteristics > FBI GRC File Standards
The FBI GRC file is a collection of well-documented, known GRC data that can be used as a standard for comparison of class characteristics of no-gun submission evidence bullets. The GRC digital database file can be searched electronically or in print form.
The general rifling characteristics derived from a fired evidence bullet are an indication of the brand(s) and model(s) of firearm from which the bullet could have been fired.
GRC file page
The data obtained from a fired bullet provides the input data for searching the GRC file, including
- caliber,
- number of lands and grooves,
- direction of twist,
- land and groove impression measurements,
- other information.
The examiner must use experience, skill, and judgment to determine and refine the parameters of the search criteria entered into the GRC file. The GRC search produces a list of potential firearms from which the bullet could have been fired.
