priming charge

Related to priming charge: priming coat

priming charge

An initial charge which transmits the detonation wave to the whole of the charge.
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The wheellock, flintlock, percussion and self-contained metallic cartridge handguns, both single-shot, revolver or semi-automatic are discharged by pulling the trigger which is linked to a mechanical mechanism releasing a striker device which by friction or impact ignites a priming charge (either loose powder, percussion cap or modern primer).
A second point comes to mind, your priming charge or cap should be able to ignite the smokeless powder easily.
The combination of a base charge and priming charge is used because PETN is a more powerful explosive than lead azide and is therefore more effective at initiating the explosive charge in the blast hole, but PETN cannot be used as the only explosive in the detonator since it will not detonate directly from the flame of the delay element.
With a clack flint strikes frizzen, whoosh the priming charge leaps to life and almost immediately the gun responds with a throaty boom, filling the air with pungent white smoke.
Flintlocks can digest Triple Seven, but Hodgdon recommends delivering five grains volume of FFFFg black powder down bore prior to introducing the main charge of Triple Seven, which must be reduced by five grains to compensate for the black powder priming charge.
Nitroglycerine-based priming charges and two detonators are placed in first, followed by 125 kilos of explosive.