Re: cheytac based wildcats
I have a hunch that once you neck it down to about .338, the 50 BMG powders will be about right for that combo, I think they're a bit too slow for the 408 caliber from what I remember though.
The 408 was based on the 505 Gibbs case, so anything .510 on down should work just fine. I think it would be sweet to set one up for .510 and throat it for the 750gr AMAX.
I've heard the brass is very good, no problems with it, 408 bullets are a different story.
I've got the specs from a 408 CT case I measured if you want them.
The 338 Lapua case is the strongest of them all, thicker than the 408 in every way. In my opinion, they should have modeled the 408 case design after the 338 Lapua.