Got curious and dug out examples of a number of different gauge, new, primed, factory Cheddite hulls. 20 ga. paper and plastic, 16 ga. plastic, 12 ga. plastic, 12 ga. paper (no pic), 10 ga. plastic. I find a variety of sealer colors on the primers (no clue if that means something) and the 20 paper appears to have no sealer. All except the 20 paper have copper color primer bodies, the 20 paper is brass colored. Referring to Kevin's info, this would indicate all have the same primer but the paper 20.
In loading various "tries" that I had tested the 20 paper ran considerably higher pressure than identical loads in plastic with what I know to be Cheddite 2000 primers. Now, is this primer difference or case volume? As I haven't accurately measures case volume plastic vs. paper, can't say. That's on my "to do" list.
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