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Originally Posted by Clark
The small rifle magnum primers have the thickest cup.
The small pistol standard primers have the thinnest cup.
Everything in between is in between.
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Interesting.
This James Calhoun article disagrees, putting large rifle as the thickest. At the same time, he makes them so thick I believe his numbers are actually the difference between the inside and outside diameters of the cup sides and not an actual bottom thickness, so I don't put much faith in them.
The drawings at the end of this report include one large rifle and one small rifle primer as well as a bunch of specialized ones. It certainly makes the specs look a lot tighter, at least for military gear.