My Finnish luger will do this with some old S&B ammo that I have. Just a very tiny pinhole in the center of the firing pin indent. Just enough to turn the indent black, but not enough to leak any significant amount of gas into the toggle. Inspecting the firing pin assembly showed minimal powder residue and no damage. Switching to other types of ammo and the problem goes away...
There are no signs of high pressure with the S&B ammo, and actually it seems to be very low pressure with a chronographed velocity of no more than 1000 fps with the 115 grain bullet, and sometimes not quite enough Omph to completely cycle the action...
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