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.
Actually the video has been taken down.
It still works for me. You have to log in with your Passport ID but it’s there.