From everything I can find, original .44-40 cartridge overall length was from 1.585 to 1.595. Not different enough from your stated .45 colt overall length of 1.60 to be a problem if S&W wanted to chamber one of their guns in that caliber. Also, I noticed that side by side, the cylinder from my original S&W DA 44-40 is a slight bit longer than the cylinder of my Uberti Schofield replica in .45 colt. I would say that length wasn't a problem. I imagine the reason that no #3 S&W was chambered in .45 colt was a mix of competitiveness and the small rim of the Colt cartridge. IMHO of course.
Last edited by MJN77; September 27, 2012 at 07:18 PM.