Sentence:  The percussion <WSD>primer</WSD>, known as the “ 110-grain percussion <WSD>primer</WSD>,” contains an igniting charge of 95 grains of black powder in addition to the essential elements of a percussion <WSD>primer</WSD>. 
Meaning of the word marked with <WSD> tags:  Any substance or device, such as priming wire or blasting cap, used to ignite gunpowder or other explosive.