The Hornady Lock-N-Load AP Progressive Press Shellplate makes changing calibers a breeze on your Hornady Lock-N-Load Press and the older Hornady Projector Press. There is a shellplate available to fit almost every caliber. The shellplate numbers correspond with the Hornady shellholder numbers for different calibers. These shellplates are designed to work with the EZ-Ject System and Pro-Jector presses.