Sorry guys.. my brain's farting.
So.. if I'm understanding this correctly , the reason for the ink would be to determine if the bullet moved when the test case was ejected.
If the bullet was pulled out slightly at ejection then the marking would indicate that the bullet moved.
Putting the bullet back where the mark showed would indicate where the bullet was when it was in the chamber ,then back it off slightly from that position to get it just off the lands.
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