A buddy in San Antonio bought a Kreighoff in 500/416. He took it to Africa and was impressed with the rifle and the round.

What I like about the 500/416 is the best of both worlds. You get a flanged cartridge for a double rifle, and you get a great long .416 bullet delivered at moderate pressures.
Remember the primise of a double is not to try and drive a bullet as fast as you can. Some people will not consider the 500/416 a "Stopper" but hey, you'll shoot it a lot more than you would say a 470.

Everyone raves about how well the .416s penetrate and that is a big plus! For me I think the 500/416 will one day become a favored standard by which other rounds will be judged. The more folks that use the round the more the word will spread.

The down side for me is that the recoil is a bit much for me. Just my opine!