OK, I may be wrong about the length. It's been a LONG time since I've actually had hands on with period guns and ammo, but I do know that the rim size on the Colt was a concern.
But, of the three cartridges - .45 Colt, .38-40, and .44-40, I believe that the .45 Colt, as loaded by the military, had the greatest overall length at 1.60 inches, which was longer by a bit than the overall length of the .44-40 using the standard bullet of the day.
I also know that when Smith & Wesson re-introduced the Schofield in the 1990s, they lengthened the cylinder.
I'm trying to track down some dimensioned drawings of the No. 3s, but so far no luck.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.