500grains wrote that article, PM him and ask about 470 Capstick.

Have you thought about 400 H&H magnum??? Its quite an exclusive cartridge sure less powerful that those big bores but still it will kill anything that walks this earth. Easy to make brass, bullets from Woodleigh, Barnes, Hornady. More efficient than 416 remington, thus more powerful. Will feed flawlessly and less work rebarreling it.
If you want something different...

If not I whould go for the 470 capstick. IMHO