Primers - Boxer & Berdan
The primer is the small charge responsible for igniting the primary fuel or propellent that sends the projectile out of the chamber, through the barrel, and downrange at the target. The primer is struck by a firing pin when the shooter squeezes the trigger.
A Boxer primer is what you will find on most any American made centerfire cartridge, and many imported brands as well. Boxer primers are designed to ignite the propellant of a cartridge through a single flash-hole, after being struck by a firing pin inside a firearm. For reloaders and hand-loaders, Boxer primers are a better choice than Berdan primers as they are less complicated to remove, partially due to the single-flash hole design of the Boxer primer.
A Berdan Primer will only be found on European or foreign-made centerfire ammo products. These are less expensive to produce than Boxer primers, but more complex to remove from a spent casing. Berdan primers are less expensive to produce because they are essentially just tiny cups full of primary explosive, and the cup can be pressed out of several metals. A Berdan primer ignites the cartridge’s propellants through two or three flash-holes, unlike a Boxer’s single flash hole design.