I've always thought that the bullet style was rather interchangeable for a given weight, assuming there wasn't a real change in seating depth (like the difference in a lead core vs a Barnes copper). I can only think of a few differences in performance between different styles at the muzzle and nothing that would affect company liability. I guess you could maybe argue that a round nose may impact the lands sooner than a spitzer and hence have a slightly higher pressure or something like that, but doubt it is much. And the reloading manuals always play CYA by saying to load reduced and work your way up to a max safe operating load.
