Primer

A small, self-contained metallic ignition cap at the center of the base of the ammunition case
When struck by the firing pin, the primer combusts, sending sparks through the flashhole of the case, and ignites the powder charge
In centerfire cartridges, primers are cylinder-shaped components composed of ignition chemicals, a cup and an anvil
Some manufacturers color code their primers to assist in use and packaging
When reloading, spent primers are removed from the primer pocket and replaced with a whole new primer
Primers for rimfire ammunition, like some factory loads for .22 rounds, are contained in the hollow rim of the case; it is not recommended that you attempt to reload rimfire cases

Alliant Powder ®