Typically createring with a OE firing pin is due tip profile.

As you may have heard (or not) you'll never indent a primer more than .020"-.022" regardless what the bench protrusion is set to. Typically the indentation is around .016-018" or at least those I've measured.

Unfortunately the factory pin tip is ground on more of a taper which extends back from the tip to the shank about .025" or a tad more which allows a gap between the tip and pin hole when striking a primer. Its also why the CCIs with their thicker cups didn't creater or blank, they are less prone to flow into the gap.

The "fix" is to re-profile the tip to a radius.



On the left is factory, on the right one I re-ground to a radius which is about 1/2 the length from the tip to the shank.

The same pins set for .020" protrusion in the same bolthead, the factory profile on the left, and the re-ground one on the right.



Now, your next question how much? I don't know. It was trial and error until I got it and my gauge right and haven't bothered actually measuring it! I start grinding until the tip matches the gauge and call it good.

Bill