mrussell - the Nosler bullet used in the 8x57 is 200gr flat based partition and the powder is BallC2. It's the only Nosler I've ever used in the 8x57mm, and the only powder I've been able to break 2400fps with in the carbine. I also seat the bullet at 3.25" COL, similar to the 8mm-06 COL.
The blast tells me the pressures are "up there", though the cases nearly last forever, easy extraction, nothing strange with the primers, the pockets stay tight - and I've worked on other hotter loads that had easy extraction, but the primers fell out upon extraction and the blast had an errie feel/sound, so I do have a real basis of pressure comparison, at least for me.
Yes, the carbine loses some velocity and the real slow powders don't work for me and that short barrel, but the medium burners will really make it cook. 175gr Sierra's run 2750fps, 185gr Rem Coreloks will tick 2550fps. H335, IMR3031, IMR & H4895 all work fine with the 150-185's, but it took BallC2 (which is supposed to be similar to H335) to break 2400fps with the 200gr Nosler Partition. Standard primers used throughout.
Case life has been terrific - most loads have been in the upper limits of most of the books - at least somewhere in some book.
