Dusty Stevens
Hollow Point Dispenser
Do your research on barker machine if you go that route
Never thought Id see a day where I could point Mr Al to something he may never have heard of:
http://www.blackdiamondrifles.com/375_Viersco_Magnum.html
See picture near middle of page for comparison to .338 Lapua. The case is around 20gr more than Cheytac IIRC. Its been a while since I kept up with the Viersco Magnum but I want to say the brass is based on .585 Nyati but with a bit higher pressures in mind. This thing is beast of a round.
Ive never heard of that case being necked down to .338 though..... however obviously theres no reason you couldnt. Bear in mind that this would be like darn near a .338-416 Barrett. 170 or 180gr H2O capacity or so. Maybe by shortening in up some you could fit to exactly what you want.
Have you considered a Sharps of a Remington Rolling Block?
Centerfire