What primers do I use???

[Doindia]

Posters have covered this, but I'll reiterate, two things, sounds like you have cases where the old primer was crimped in and the remaining crimp left after depriming needs to be removed, and it sounds like the sizing die isn't screwed down far enough.

If you already have a deburring tool you can simply use that to remove the remaining crimp at the top of the primer pockets.

I’d bet my house on both of these exact things. I’m fairly new to this cartridge also, But ask me how I know