It probably comes down to barrel length and stuff because all of the reloading manuals show pretty much a dead heat. Some give the 7x57 a very slight edge with the 175 grain bullets and the 7MM-08 an adge with the 160 grain and lighter bullets. Pressure limits are 52000 for the 7MM-08 and 50000 for the 7x57. In the field, I can't imagine that anything or anyone could see a difference. I have used them both as well although my use of the 7x57 has been with all 175 grain bullets.