As it's usually in the dark when I set it off and as I always toss the empties I don't know the answers to your well reasoned questions.
I toss the empties because of how the fixed firing pin impacts the primer. It looks like it does a number on the primer pocket and even though I am using reloads I do not think the ones that have been through the bang stick are good candidates for another reloading.
I'll go down to the river tomorrow and set off a couple of test rounds with the black on them as you suggest and then have a look.
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