All CCI Primers have a larger anvil location to compensate for firearms that will have an off-centre firing pin and are engineered to help clean feeding in automated reloading gear. The APS (Automatic Priming Process) primers are preloaded into colour-coded plastic strips for use in the proprietary RCBS APS primer https://cci-300-z-ndh-tchen-large92612.bloggerchest.com/31461161/the-ultimate-guide-to-remington-9-1-2