For what it's worth, my dad has handloaded some 255 SWC in 45 ACP that I usually use in my 45 colt, to me it seemed noticeably more powerful. I believe Buffalo Bore offers a 255 SWC load in 45 Auto. I really like that bullet style, if it goes at least 800 fps I think that would be a good load, better than 230 grain at least.
-Hayden