British .303 Mk IV charger "P IV" with raised markings

The first 2 photos show both markings sitting in a circle, the “IV” is just a circle but “P” circle is visibly raised. Any reason/meaning to this? The last photo shows a regular normal impressed look, just for comparison.

Good question … from the workshop drawings I’ve seen of the press-tools involved, the bunter that made the markings was a replaceable item fitted into a round hole in the tool, I suppose because it wore out more quickly than the other, more substantial parts. If the bunter wasn’t completely flush with the surface of the tool, with only the raised “relief” standing proud, then the force of the process extruded the surface of the charger up into the bore holding the bunter … causing the raised “land” you see in the picture.


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