Ry has a video of the Cheytac 408. Very impressive gun and cartridge.

The history was interesting to me as well. I did the same sort of thing with my .300 Win mag. I chose a bullet (the Berger 210 grain VLD) then built the gun around it. I also wrote a program for my calculator to do the trajectory calculations. I did not include the rotation of the earth into my program however. At the latitudes and ranges I expected to be shooting the rotation of the earth contributed less than 1 MOA so I figured I would just estimate that in my head if really needed.