A New Standard Bullet

In September 2018, NIST announced the update of its standard bullet for forensic science use.

SRM 2460a: The Standard Bullet is an object designed to look like a typical 9mm bullet that has been fired from a gun. "A series of six parallel markings appear on its surface, and if you turn it under a light, you can see that those markings are made up of fine striations, which are reproduced precisely on each standard bullet, down to the microscopic level," wrote Rich Press in an article on the NIST website.

The standard is used to test whether a forensic laboratory's 3D surface scanning microscope is properly calibrated. "The prior version of the standard bullet, which was manufactured using a diamond-turning process that engraved the striations onto the bullet, cost more than $2,000 each," the article stated. "With funding from the National Institute of Justice, NIST physical scientist Thomas Brian Renegar developed a new manufacturing method that involves casting polyurethane copies in a mold, then plating them with nickel and gold. This new method allows NIST to sell the standard bullet for $350."

You can read the full article here. <https://www.nist.gov/news-events/news/2018/09/nist-updates-forensic-standard-reference-materials>

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