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In page Cartridge (firearms):

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Snap caps and action-proving dummy rounds also work as a training tool to replace live rounds for loading and unloading drills, as well as training for misfires or other malfunctions, as they function identically to a live "dud" round that has not ignited. Usually, one snap-cap is usable for 300 to 400 clicks.[citation needed] After that, due to the hole at the false primer, the firing pin does not reach it.