New 223 is cratering primers

[Gabe1972]

I'm trying not to sound too stupid, but what is cratering on a primer?

[tomme boy]

Photo off internet. Not mine

[Chrazy-Chris]

I'm trying not to sound too stupid, but what is cratering on a primer?

I'll back Gabe up and ask the next logical question - why is it bad?

[FW Conch]

It means that the explosion that has occurred inside the cartridge case has produced so much pressure that it has tried to push the primer through the firing pin hole. Almost certainly more pressure than the case is designed to handle. Any more pressure, and the primer could rupture, or blow out, causing damage to the action parts. :-((