Oversize Firing Pin Damage

[DonVoigt]

Originally Posted by Kiwi Mark

Hi, I found that when setting up the head space in the new barrel that I couldn't find a case that was on. 754". So used a case that was 0.750" and used a piece of paper as a feeler Guage as it is 0.004"thick. Shown in photo.
Perhaps Military Ammo has crimped primers to make up for the variations in head space, maybe a reasonable knowledgeable members may be able to let us know.

No, crimped primers would not "make up" for headspace.
Military weapons would have correct head space, and if a problem developed, they would have been repaired.

To the comment above, on suitability of your make shift head space gage, while much better than nothing- a guy who can thread and turn a barrel can make a steel head space gage without problem.

Should be a quick and easy project, dimensions are to be found on line.

[DonVoigt]

Here is what a firing pin protrusion gage looks like.
The white one is an original Kreighoff tool, and the strawed one my own mfg.
The U shape cut at the top of the original serves no purpose, except perhaps for fixturing during mfg.

[Rick W.]

The method of a piece of brass(empty case) and paper shim in your picture will give an erroneous measurement. Both materials are easily compressible.