thumper

Federal making the ammunition is probably
the main reason.

470 Nitro was also a calibre in the past that was
released to the trade early (ie not a proprietary calibre like
500/465 etc) so alot more guns were made in this calibre
than others.

In the past, 500 Nitro was another level up and not that many guns
were made in 500 which then supposedly lead to less ammunition
being available which of course then led to less people wanting a 500 !!!
The never ending circle.

470 is a safe bet - easy to get ammo for anywhere in the world,
easier to shoot, easier to offload when you decide to sell it, and
if the bullet is put in the right spot ill do anything any other big
bore would do.

Good luck with your looking and purchasing.

500 Nitro