For 9mm ammunition, you should use *little pistol primers*. Here are a few distinct suggestions and things to consider: ### Primer Type - *Little Pistol Primer*: This is actually the common primer employed for reloading 9mm ammo. Manufacturers like CCI, Federal, Winchester, and Remington all develop reputable smaller pistol primers. https://winchester-400-primers-5092345.tribunablog.com/look-at-highly-regarded-manufacturers-recognized-for-good-quality-and-dependability-45861363