Black powder fouling left in cases absorbed most of the mercury from those first centerfire primers, but a stronger primer was required to reliably ignite smokeless powder, which arrived in the 1890s. The arrival of centerfire cartridges resulted in the primers recognized today. American Joshua Shaw is recognized as inventing the percussion cap in 1814, finally settling on a mixture of fulminate of mercury, chlorate of potash and powdered glass. Alexander John Forsyth is credited with developing fulminate of mercury as a percussion system (1805) that could be detonated by a firearm’s hammer. The priming compound is a pressure-sensitive explosive, though, and primers should be treated with care.ĭuring the last two centuries, continual improvement of primers has been just as important to handloaders as smokeless powder. Toward primers and consider them no more hazardous than common matches. A handheld priming tool allows a handloader to feel the primer seat properly.
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