The Hornady Shellplate #40 is designed for use with both Lock-N-Load AP Progressive Press and Projector Press systems providing versatile reloading capabilities for specific cartridge calibers.Hornady Shellplate #40Compatible with Lock-N-Load AP Progressive PressWorks with older Projector Press modelsQuality construction for years of reliable serviceEnables easy caliber changes during reloadingEssential for reloaders who want quick caliber switching capabilities this shellplate streamlines the reloading process while maintaining Hornady's reputation for precision and durability.