They were available for a good while. Probably because FB was down and it wasn't shared 1,000,000,000 times.
They have been available multiple times the past two weeks on midsouth, Natchez, midway. Sign up for notifications
Out of those cartridge options I would buy a 6.5 barrel and have it chambered using the 6.5 prc Alex Wheeler 2 reamer in order to avoid the "clicker" problem. Then have Shaen open up your bolt to magnum bolt face.
But if you are open to options, look at the 7mm Sherman Short magnum. Rich...