Conversely, if the primer is seated with too much force, it is farther from the firing pin. If the primer is not seated to the bottom of the pocket, the primer is not as sensitive because it moves forward slightly upon impact with the firing pin, thus cushioning the impact force. ![]() The legs of the anvil are slightly compressed during the seating process (called cocking the primer). For best sensitivity, the primer should be seated firmly to the bottom of the primer pocket, but not unduly crushed into place. Improper loading techniques can also cause primers to perform poorly. These all can affect ignition reliability. ![]() Excessive chamber headspace allows the cartridge to be farther forward in the chamber, or the case might move forward when struck by the firing pin. Headspace is the measurement from the slope of the shoulder to the base of the cartridge or the corresponding dimensions in the rifle chamber. Misfires can be caused by excessive headspace on the rifle.
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