×

How to Identify Bullet Casing Caliber

by Kenrick Callwood ; Updated July 21, 2017

All modern, mass produced bullets are easy to identify from just the casing.

bullet image by glgec from Fotolia.com

Caliber refers to the diameter of a bullet being fired from a gun. The measurements are taken in hundredths of an inch, meaning a 30-caliber bullet has a casing diameter of .30 inches. The caliber of the bullet does not necessarily provide any information about the load, or the amount and type of powder inside the casing. Variations on length and weight are common within the same caliber casing. Identifying the caliber from the casing is a simple.

Identify the casing of the bullet. This is the lower half of the bullet, usually a brass or copper color.

Turn the bullet so the bottom of the casing is facing you.

Locate the firing pin. This is the small inner circle at the center of the base of the bullet casing.

Read the engraving, known as the "headstamp," found around the outer ridge of the bullet casing surrounding the firing pin.

Locate the number preceded by the decimal point to identify the caliber.

Photo Credits

About the Author

Kenrick Callwood has been involved in Internet marketing since 2007 and his work has appeared in numerous online publications. His main areas of expertise are psychology, travel and Internet marketing. He holds a bachelor's degree in psychology from California Polytechnic University.