All CCI Primers have a larger anvil spot to compensate for firearms which could have an off-centre firing pin and they are engineered to help smooth feeding in automatic reloading gear. The APS (Automatic Priming Method) primers are preloaded into colour-coded plastic strips to be used inside the proprietary RCBS https://z-ndh-tchen-cci-50080123.getblogs.net/64122920/cci-250-for-dummies