Remington cartridge cases are carefully drawn from specially-alloyed brass to provide consistently exact internal volume and resistance to case stretching and brittleness. Primer pocket tolerances are held to .001", and closely monitored case neck annealing assures easier re-sizing and longer reloading life. This new brass is pre-primed with Remington primers. Within every Remington 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. New, primed brass. This is not loaded ammunition. Bulk brass should be full-length sized, trimmed and chamfered before loading.