Interesting .303 MkII round of ammunition

I purchased 170 rounds of .303 MkII ball ammunition and only one of them had this hollow point nose. I wonder if it is a MkII* or Special as produced by Dum Dum and Woolwich but the E would suggest otherwise. The Woolwich experimental one was a hollow point instead of the exposed lead of the Indian made Dum Dum. The hollow point on this looks like it has been stamped into the nose - hence leaving quite sharp edges. It is very different from the MkIV and MkV hollow points. All opinions are welcome.

40 odd years ago a box or partial box of that stuff turned up around here. I ended up with some loose, a packet and a paper. IIRC it had a short production run as the Hague Convention of 1899 outlawed the stuff, except against "savages".

One of the loose ones:

Back in the 1920's and 30's there were a variety of hollow-pointing tools available from various small-scale makers. These usually took the form of collar that fitted neatly over the nose of the bullet and accurately guided a drill to a pre-set depth. The only official hollow point .303 rounds were the marks III, IV, and V. The Mark III had an inserted tube while the Marks IV and V had a smaller diameter hole than your example. The Dum-Dum was an exposed lead soft point of fairly small diameter. There were some experimental hollow-points loaded into Mark II cases for testing purposes only. Can you accurately measure the inside diameter of the hole and also the depth so I can compare it to known drawings? A couple of clearer close-up photos would also be useful.

The HP MKVI I thought were manufactured at the Kirkee plant in India.

Width of the hole is 3.45mm or 0.1355" Depth is 7.35mm or 0.289". The hole seems to have been partly filled with beeswax or some similar material.

The cavity size does not correspond to any official or experimental hollow point bullet that I have info for. Pretty much all the 'official' styles (issue and experimental) had a cavity 2.5mm wide and 8.9mm deep.