Two small flash holes sat astride a small elevated protuberance in the cup—now called the anvil. When the firing pin struck the primer cup, it crushed the compound against the anvil, creating it to explode and vent the hot gases and sparks in the flash holes, igniting the charge. For https://remingtonprimers91227261.blogoscience.com/23216029/facts-about-large-rifle-primers-federal-revealed