I've said this before, but when you run the 45 ACP out a revolver you do have more options available to you than if you were using an autoloader. Suddenly you are free from the constraints that an autoloader places on bullet design. Flat-nosed or Keith-style SWCs that may stall out on a 1911's feedramp pose no problem in a revolver. And Elmer Keith and others have shown that old SAA-spec 45 Colt level velocities are possible out of the 45 ACP case with these bullets of large meplat and respectable weight. I have seen plenty of data that suggests that 900fps should be possible with a 255 grain Keith SWC. That opens up all kinds of possibilities for the old ACP. Energy figures for such a combination will never impress but Keith, Seyfried and many others have shown that a large diameter, moderately heavy slug at modest velocity will penetrate like there's no tomorrow. You decide, but I think the 45 ACP out of a revolver is capable of more than some are suggesting.