While many different cartridge priming methods have been tried, only rimfire and centerfire survive today in significant use. http://en.wikipedia.org/wiki/Rimfire Center fire ammo A centerfire cartridge is a cartridge in which the primer is located in the center of the cartridge case head.Unlike rimfire cartridges, the primer is a separate and replaceable component.The centerfire cartridge has replaced the rimfire in all but the smallest cartridge sizes. Except for low-powered .22 and .17 caliber cartridges, and a handful of antiques, all modern pistol, rifle, and shotgun ammunition is centerfire.t is called a rimfire because, instead of the firing pin striking the primer cap at the center of the base of the cartridge to ignite it (as in a centerfire cartridge), the pin strikes the base's rim.
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