All CCI Primers Have got a larger anvil location to compensate for firearms that may have an off-centre firing pin and they are engineered to help smooth feeding in automatic reloading equipment. The APS (Automated Priming System) primers are preloaded into colour-coded plastic strips for use inside the proprietary RCBS https://lanesqqxd.blogzet.com/the-definitive-guide-to-large-rifle-magnum-46427468