that's itit is from the only one in Australia (that I know of) , a Gunsmith here in Adelaide made it up
So what is the official list. We have .22 mag, 243, WSSM ( I knew I saw that before, It was in a Guns and Ammo in one of the columns in the front I will try and find it and put up a link) .500 Phantom and what else.
If this posts twice, I'm sorry, I think #6 is a 7x57 mauser commercial round.