Greetings Charliehorse,
A good question would be what was the velocity and was this in line with the ADI/ Hodgdon data. If it was then your pressures should match theirs reasonably well. The slight mark on the lower case looks like a stamp mark to me. You get these with plunger extractors where the edge of the extractor hole is a little rough. I can't see a shiny rub mark though that would indicate a high pressure load. Have a look yourself in good light. You may also wish to check that the projectile is not too close to the rifling. This or a tight chamber or bore should show up on the chronograph. I wouldn't read too much into the primers.
Regards Grandpamac.
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