Buy Large Pistol Primers. CCI Large Pistol Primers are a type of primer used in firearms ammunition. They are designed for use in large pistol cartridges, such as .45 ACP, .40 S&W, and 10mm. CCI Large Pistol Primers are known for their consistent ignition and reliability, and are a popular choice among reloaders. They have a hotter ignition and a larger sweet spot than standard pistol primers, ensuring consistent performance in a variety of firearms and ammunition types. CCI is a well-respected brand in the shooting and reloading communities, and their Large Pistol Primers are widely available and reasonably priced. It’s important to choose the correct primer for your ammunition and firearms to ensure safe and reliable operation. CCI Large Pistol Primers For Sale.