Reloading your own ammunition: Depriming
from By Ken Jolly
Primers are small inserts in the base of center-fire cartridges that spark the ignition of the gunpowder. Thus, when working with primers, safety is a primary concern. There is always the possibility of a small bang, and safety glasses should be worn when working with these. Depriming — or removing the expended primer — is accomplished with a die in your set that punches the spent primer out of the cartridge and at the same time resizes the cartridge to bring it back into spec.
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