An opinion... I would think that barrel length would definately play a part in load selection.
As I prefer 10" barrels, I USUALLY start with the faster range of appropriate powders. The faster powder/shorter barrel thing doesn't always work out, though, from an accuracy OR velocity standpoint. It pays to experiment.
Right now, my preferred load for our smallish (usually <100#) whitetails is a Nosler 120gr Ballistic Tip, over 30gr AA 2460.
I do find that the ballistic tips tend to perform more in the manner of a controlled expansion bullet, when fired at 7TCU velocities, as compared to their more explosive nature when launched from my .280 Rem. FWIW,,,,,,,,,Bug.