You can usually get the advertised velocities on the manufacturer's web sites, if they are not on the boxes. However, you will hardly ever get the velocities they say they get.
I've only chronoed practice ammo, UMC 150gr FMJ out of my Garand. I got 2,854 fps, according to my notes. A little much for that rifle, but I didn't know better at the time. Hunting ammo is usually slower thant what the manufacturer says and reloads can easily better them. With my reloads I am getting a max of 2,840 fps with Speer 180gr SPBT out of my 24" Voere M98, almost as fast as the 165gr Hornady GMX out of the same rifle.