I was recently lucky enough to acquire a cartridge case for the experimental .661 inch naval HMG by Vickers, dated 1937.

So, now of course I'd like a bullet to go with it - which means having a replica made. There is a photo of the bullet in Peter Labbett's British Small Arms Ammunition 1864-1938 but it would be helpful to at least know the length of the bullet, and ideally have a drawing with measurements. Can anyone help?