Re: question on cheytac rounds
Welcome to the forum Mitch.
The most popular wildcat cartridges based on the .408 case are the .338 and the .375 at the moment. Either one of these combinations will kill an Elk at 1K. They are "ballistic twins" out to about 1,800-1,900 yards. So you can compare and contrast the both and still end up with a choice based on personal preference. The over the counter bullet selection for the .338 is better as the 300 gr SMK is a pretty damn good bullet out of the box. Forget the Bergers as they do not like the velocities the .408 case is capable of pushing them. The 350 gr SMK for the .375 is a little tougher to get, but can be had.
You will need a custom action designed to handle the .408 case. Hall, Stiller, and BAT actions are all good choices. The Stiller can be bought in a single shot or repeater configuration.
I own a few of these combinations and have been shooting them for years. taken them both out past 2,000 yards with excellent results. I've deviated from the norm, and have improved cases and played with fast twist barrels and lathe turned bullets.
If you decide to take the leap, the standard versions are very user friendly.