Mike,
They all work. If somebody believes in high velocity, 120-130 grain bullets will do the job. If they prefer tradition, 175's will also do the job.
Went through a period of using 156-160 grain bullets of various makes, mostly because in my present 7x57 they all land in the same place at 100 yards, when using the same powder charge. It was a handy way to compare bullet performance, especially when shooting lots of animals, as I was for a while on cull hunts in Africa. They all worked.
Right now I'm using 140 Sierra ProHunters at 2850 and 150 Partitions at 2750 from the same rifle. They shoot to the same place, so I just use the bullet that seems right for the job at hand.
