These are the same primers Remington uses in the production of their own ammunition and performs to their highest standards. If you want the best possible out of your firearm you have to start with the best that’s why reloaders choose Remington components for their loads. Within every Remington, a primer is a group of subcomponents assembled to exceptionally tight tolerances. Primer cup dimensions are controlled to .0001″, and the priming mix is specially formulated for consistent ignition with a wide variety of powder types. Primers are tested for reliability from -20 degrees F to 150 degrees F. The unique tripod anvil design creates a larger strike area with maximum sensitivity, even with off-center firing pin strikes.