Hi, I am new to the forum. I joined the IAA in September and this is my first forum post.
In the 1990’s I acquired this British cartridge, which is a .500 3" Nitro Express necked down to .458. I am pretty sure I got it from Jim Tillinghast. I’ve lost the documentation during a move and can’t remember what exactly this cartridge is. I am familiar with most of the British sporting rifle cartridges, but I have not found any reference by searching online or in the IAA forum or in any of the books I have. Could it be an experimental? Can anyone identify it?
Headstamp is KYNOCH .500 NITRO. The primer is flat brass with a dark purple annulus. There is a 3-segment neck crimp close to the shoulder. The bullet is a GM jacketed round nose soft point. Without pulling it I would guess it is a 500 grain bullet. There is powder in the cartridge with a fair amount of air space (at least 1/2" I believe) and it does not sound like Cordite. I have not weighed the cartridge.
Case length: 3.00"
Neck length: 0.41"
Shoulder diameter: 0.524"
Bullet diameter: 0.458"
Thanks for your help!