Will be taking the F 12 to the range in the meantime on a hunch I dug up a batch of Handytak in my modeling desk drawer.
I broke of a piece big enough to fill the primer pocket and sit flush with an empty case head. Placed empty case in chamber... closed the bolt...pulled the trigger and you can see the dent in the HandyTak made by the firing pin.
After each trigger pull I only needed to extract the empty case and smooth out the dent with a finger tip and redo the test.