Corelock Remington no longer makes the 209-4 primers. The 209p is the only primer they make now. They use it in all there shot shells from 410 to 12ga. When my supply of 209-4 is all, I plan to use standard CCI 209 primers, they are the coolest primer next to 209-4. I have used CCI's in the past and they helped this the crud ring. All so a lot cheaper then the 25 ACP, without the cleaning and reloading.