Type of primer common outside the US with no integral anvil. Anvil is formed in bottom of primer pocket in the case. Named after the inventor, Col. Hiram Berdan, an American.

A centerfire priming system characterized by an anvil mounted in the case's primer pocket with one to three small, off-axis flash holes. Berdan primers have no anvil as the anvil is integral with the case. Poorly suited to reloading. Common in Europe, especially in military ammunition. Named for the inventor, Col. Hiram Berdan, an American.