Actually, Speer has (or had) the same concern that RatDrall has. The Speer white paper for their "short barrel" GD bullet established a nominal range of 860-1050 fps. Beyond that, the bullet is / was liable to fragment. That was for the original 135-gr. I have a pdf copy of the white paper on that; if you want a copy, e-mail me.
However, IIRC, Speer 'redesigned' their GDHB bullets last year to drop the minimal velocity required--anyone have a link to that info? I think they now claim it will at least start to expand below 800 fps. And, I do not recall if they have tweaked their specs for the different bullet weights....
So, if any one has any links, chime in, please.
Jim H.