470 Capstick
The 470 Capstick  is a Huge Proprietary Cartridge that  was designed by Col. Ardor B. Alphin.   
I  have not been able to find out the  year it was introduced .   
It was named for the famous big game hunter, and author, Peter Capstick.
It started as a wildcat cartridge, by  necking out the 375 H&H Magnum Case to except .475" diameter,  
500 grain projectiles.
It is now made by a very few small ammunition companies, which now makes it a Proprietary Cartridge.
Proprietary Rifle Cartridge Section
Special run by
Kynoch of England
470 Capstick
with a 500 grain
(Full Metal Jacket)
"Kynoch 470 CAPSTICK"
$19.95 for
One Cartridg