As with fingerprints, every firearm can have unique characteristics and, when fired, can impart unique signatures on bullets and cartridge cases. By analyzing these signatures, examiners are able to connect a particular firearm to criminal firearm investigations. The NIST standard bullets (SRM 2460), and standard cartridge cases (SRM 2461) have been developed as reference standards for crime laboratories to help verify that the computerized optical-imaging equipment in those laboratories is operating properly and to facilitate firearm tool mark measurement traceability and laboratory accreditation. These two standards also serve as quality assurance standards for 3D instruments being implemented for measurements of firearm tool marks. Below are the master reference measurements as virtual standards used for comparisons. For more information about these two standards, please visit: https://bit.ly/2WI9ulm

The data are presented in ASCII format. The first column contains the X values in millimeters and the second column contains the Z values in millimeters.

The data are presented in ASCII format. The first column contains the X values in millimeters and the second column contains the Z values in micrometers.

The data are presented in ISO 25178-72 X3P format. For more information on this format and ways to read/write, please visit http://www.open-fmc.org.