Managed to squeeze a bit more life out of my file uploader, so for the sake of completeness here are the images of the case-heads/primers from my AR2213SC (H4831) sequence described earlier.

Closer view of the maximum load:

You will all likely agree with the lack of pressure signs, but the feint cratering visible on the 66gr loads (3 on the right) is definitely there. Maybe I'm a sook when it comes to revving these things up, but the rifle is at least a hundred years old presumably, and may have passed through the hands of a fool or two in that time, so who knows?
Better to be careful than dead!