Difference in Cheddite primers?

[Roundsworth]

I compared loaded RST shells in 20, 16 and 12 gauge. All had the CX2000 primer, based on the comparison photo of the three Cheddite primers.

[6pt-Sika]

Anymore the only primer I prefer not using is the Fiochi 616 . I loaded a bunch of 28’s for a friend years ago on his press using his components and he had the 616’s . I got them in the nice old style AA hulls but none would hold WIN primers after that.