I think that comes from the original military loading for the 7x57, it was 175 grains, but this is no longer the case. With the construction of todays bullets the 140-150 grain are excellent medicine for anything up to and including Elk. There is certainly nothing wrong with the heavier bullets, but dead is dead, why beat yourself up with recoil? I have seen suprising accuracy from your regular green box remington and white box winchester ammo. One thing to remember about belted cases is that those stupid belts can have a deterimental affect on accuracy. If the cartridge is headspacing on the belt instead of the shoulder, you won't have the consistency you need.