Happy collecting, Peter
What was this one used with?
What do the words: “Not given to Admiralty.” mean?
Not sure Dave. I can only presume that this tolerance was not shown on the drawing that was approved by the Admiralty. I have not seen that on any other drawing.
EOD - I think this was intended for use in the 1 inch Aiming Rifle for sub calibre practice, perhaps to give a better indication of the strike on the target. I doubt very much if it was intended for any operational use, having an all lead bullet.