Thought I would try this again.
The purpose for this post is not to discuss the chamber casting itself although I am always open to improvements. However, this example was "cast" using a Marlin 1894CB barrel cut to only 4". Lead poured into the case then additional lead inserted and hammered into the case mouth/neck and rifling...expanding the case to it's maximum diameters.
This post is to discuss the differences between some early manufactured and modern manufactured 44-40 rifle chambers. Although this is not a side-by-side examination of two actual castings, this should certainly shed some light on the differences....namely the AOL and Diameters from the case neck to the barrel rifling.
If someone would like a measurement from a location not noted, just let me know.