Primers must be stored inside of a cool, dry spot far from direct daylight and moisture. Preferably, they need to be saved in an ammunition cupboard or storage box designed to limit temperature fluctuations and humidity. These are generally the “bread-and-butter” of reloading, the mostly named-for primers in reloading recipes. https://tysonoiyof.targetblogs.com/31548031/facts-about-cci-200-primers-in-stock-revealed