its interesting to note how much Kynoch ammunition in 8x50R come to surface now. it seems that Kynoch was the only maker of sporting ammuntion in this caliber after WW 2 for a long time. I wonder when they start to making this again and what the main market was. found it in a german list from 1972 as available so there must have been some stock after the end of Kynoch.

http://www.egun.de/market/item.php?id=3456902

for other 8x50r cartridges:
http://forums.nitroexpress.com/showflat.php?Cat=0&Number=174842&an=0&page=0#Post174842