A magnum primer produces a hotter, more intense flame. This is produced by adding a powdered metal, such as aluminum, to the the priming compound. They are used to ignite larger charges or more "hard...
Small Pistol Primers are used for small caliber pistols, any of the various 9mm calibers such as the .380, the 9mm luger, the 9x18 makarov, the .38 special, the .32 acp, the .25acp etc. and even some...