I will not call myself an expert, I can tell you what I've researched and seen.
Short Barrels affect any caliber, particularly the smaller ones that depend on velocity to achieve results. That said there are two types of ammo that appear to work well in the SB .45, the Speer Gold Dot Short Barrel ammo and the various varieties of the Barnes Copper rounds. Cor-Bon, Doubletap etc load the Barnes rounds.
It should be said FMJ .45 has killed a lot of people on multiple Continents, so even limited expansion still leaves the .45 ACP a potent round.