Ripp, What muzzle velocity do you get from your .416 Rem with a 400 gr bullet?

General comments:
I note this article claims the same muzzle velocity for both the larger Rigby case as the smaller Remington case? Unlikely imo and not per most velocity claims. I thought it was the Rigby 2400 fps and the Rem 2200 to 2300 fps? Not much difference in field terms of course.

If the .416 Rem Mag uses a 8mm Rem Mag case which I thought was a magnum length case? Why then can a .416 Rem Mag, I believe, be made in a standard length action? Correct or incorrect? Maybe I am thinking of the .416 Chatfield-Taylor?