My data all stops at around 48,000CUP for 3,000fps with 120's in the 7x57. I see 7mm08 listed to 3,100fps+ using 120gr. TSX's but with one powder only in Barnes text.

I also have data for 6.5x55 and .260 Rem. pushing 120gr. at over 3,000fps.- so if the guy was stretching the 7x57 closer to 65,000psi, it's possible along with 24" or more of barrel, to get 3,200fps, I suppose. Much over 65,000psi and you exceed the elasticity of the brass and expand primer pockets as well as making extractor groove marks on the case head. As well, extraction gets sticky - that's a prime indicator to say you've gone too far.