True, but the guidelines for those 139 grain and 140 grain loads comes from the article written by John Barsness. He said that getting over 2900 from a modern rifle was no trick with that bullet and that one should be safe in that range.
I don't believe in turning a 7x57 into a 7mm Magnum, but it is a wonderful cartridge that can get you very close to what is possible with .280 with less recoil and significantly less muzzle blast. I hate muzzle blast and that is one reason I like the 7x57 and the 6.5x55 so much.
